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  1. #1
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Mercruiser 470 stator question

    So I just changed oil and new coolant, and found two free wires coming from the stator. They are wrapped in electrical tape at the ends and there are two more wires coming along with the power wire from the battery. All four wires are electrical taped at the ends, what should be right here? The engine runs awesome, but I guess this is the on board charging system. I have been starting the boat all week and letting it run for a while and the battery has still not died. I will have an onboard charger three bank system so if it takes a long time for the engine to drain the battery I will be fine. What do you guys think?

  2. #2
    Join Date
    Aug 2006
    Location
    SW Ohio, USA
    Posts
    10,328

    Default Re: Mercruiser 470 stator question

    Are you sure there isn't an alternator installed already? If not then the PO disconnected the stator due to problems. You are going to have to have a charging system. Install a single wire alternator kit. This is a Non-pwr steering kit. http://www.ebay.com/itm/MERCRUISER-3...s_Gear&vxp=mtr

    If you have pwr steering you need this kit.
    http://www.ebay.com/itm/PLATINUM-470...s_Gear&vxp=mtr
    Last edited by guyjg; 03-29-2012 at 10:26 PM. Reason: add data
    Fix minor things (replace wear items for preventative maintenance.) that cause major problems before they break.

  3. #3
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 470 stator question

    You will need to remove the stator coil after you install the new alternator. Having a stator producing AC voltage on your engine going no where is a bad idea.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  4. #4
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question

    I really don't have the money to buy an alertenator kit. They might have had one on it then probably took off when sold.

  5. #5
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    3,486

    Default Re: Mercruiser 470 stator question

    Quote Originally Posted by jadilla View Post
    I really don't have the money to buy an alertenator kit. They might have had one on it then probably took off when sold.
    It may cost more to get the original charging system to work then to buy and install a one wire altenator system. The regulators are very expensive and so are the stators.........

  6. #6
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 470 stator question

    You should be able to find a used one. (alt Kit that is) There are enough boats around with these engines that have been converted.

    Or have three fully charged group 27 dual purpose batteries on board when you leave the dock. One for the ride out, one for the ride back and one just in case. The alt kit would be cheaper.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  7. #7

    Default Re: Mercruiser 470 stator question

    That's a shame, the previous owner should have told you that he removed the charging system. kghost is right about it costing more to go back to the original charging system. I know it is expenive for the alternator kit but it would be your best bet at this point. ($300-$400 new) I personally wouldn't go out with that boat unless I had a charging system. Bilge pumps, engine, gauges, tilt trim, marine radio, fish finder, anything electrical will suck the battery(s) down pretty fast. just not safe! jmho. Take your time and do it right and you will feel alot safer. You don't want to be getting towed in! That costs money too.

  8. #8
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question

    True true.... I have a couple of fully charged batteries, but what I don't understand is the fact that the batteries have not died. I have one little automotive battery hooked up and it has not died. I sat there and let it idle for close to 25-30 minutes then bumped it up a bit to let it run and work the oil in well. I'm going to use it for short runs on the lake striper fishing, I guess I will go ahead and get everything done and as soon as I get some mullah accumulated I will go with the alternator kit.

  9. #9
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 470 stator question

    Quote Originally Posted by jadilla View Post
    True true.... I have a couple of fully charged batteries, but what I don't understand is the fact that the batteries have not died. I have one little automotive battery hooked up and it has not died. I sat there and let it idle for close to 25-30 minutes then bumped it up a bit to let it run and work the oil in well. I'm going to use it for short runs on the lake striper fishing, I guess I will go ahead and get everything done and as soon as I get some mullah accumulated I will go with the alternator kit.
    All your powering is 7-8 volt ignition system and a few gauges. The battery have enough power to run the boat for half the day, barring a radio and use of the running lights.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  10. #10
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question

    could I get something like this, it looks similar to the other one on eBay but produces 40 less amps but is $200 cheaper?

    http://www.ebay.com/itm/Willys-Jeep-...#ht_1116wt_952
    Last edited by jadilla; 03-30-2012 at 01:37 PM.

  11. #11
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 470 stator question

    Quote Originally Posted by jadilla View Post
    could I get something like this, it looks similar to the other one on eBay but produces 40 less amps but is $200 cheaper?
    Something like what?
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  12. #12
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question

    Quote Originally Posted by Docksidemarineservices View Post
    All your powering is 7-8 volt ignition system and a few gauges. The battery have enough power to run the boat for half the day, barring a radio and use of the running lights.
    Awesome, I will run the engine on one battery and run everything else on the other two batteries. I have a huge garmin 10 inch monitor gps i'm going to have to make sure I run on the other batteries.

  13. #13
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question


  14. #14
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question

    sorry I added the links

  15. #15
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 470 stator question

    Quote Originally Posted by jadilla View Post
    Awesome, I will run the engine on one battery and run everything else on the other two batteries. I have a huge garmin 10 inch monitor gps i'm going to have to make sure I run on the other batteries.
    Read post #6

    I was more or less kidding. But it could be done if the kit is not in your budget.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  16. #16
    Join Date
    Jul 2007
    Location
    Lake Ozark, MO, USA
    Posts
    67

    Default Re: Mercruiser 470 stator question

    I don't recommend running on batteries, ever. JMHO, that is for limping home only when something is broken.

    NEVER us a automotive alternator from your earlier post, use only a marine alternator conversion kit. Fires and explosions tend to cost more then the hundred bucks you thought you saved.

    Something else to look for. Previous owner probably had the voltage regulator fail and as you suspect had an alternator. New voltage regulators are $550-600+. Since you have to start over, check to see if the voltage regulator has been removed from the block & cooling loop, if not take it out and put a new hose in that "run" for a bit better coolant flow and fewer leak paths. A new Alt kit is HALF the VR price and if you can likely find a used Alt kit for probabably less, but of unknown condition of course. Maybe buy it from the orginal owner???
    Number one killer of batteries is heat, it is hot in the bilge; number two killer, running down starting batteries like deep cycle batteries, they are not designed for deep discharge activity which is what you are asking to do. That thing will be junk before you know it. Be safe and save some long term money, you will have a much better summer and you will get more life out of your battery you already have with an alternator.

  17. #17
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 470 stator question

    The jeep kit is a definite NO NO!

    Here is what you need.

    http://www.ebay.com/itm/MERCRUISER-3...s_Gear&vxp=mtr
    Last edited by Docksidemarineservices; 03-30-2012 at 03:04 PM.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  18. #18
    Join Date
    Aug 2006
    Location
    SW Ohio, USA
    Posts
    10,328

    Default Re: Mercruiser 470 stator question

    You need to be running the bilge blower at a minimum of 3-5 mins. before every start and 5 mins. after fueling which draws the battey down. It is also a good thing to run the blower while under way to remove latent heat gain from the dog house. Your carb will appreciate it. A few boaters have gotten alternator brackets from junked cars and made some modifications to the mounting bracket holes...it will save you some money. The 110 amp marine alt. is good to have for the charging power but not a necessity. A 65 amp marine alt. will suffice and save some money...make sure it is a single wire self exciting type. Make sure you size the charging wire to match the alt.'s output! I prefer 8 ga. wire for 65 amp. and 6 ga. wire for 110 amp.
    Fix minor things (replace wear items for preventative maintenance.) that cause major problems before they break.

  19. #19

    Default Re: Mercruiser 470 stator question

    jadilla, when I first rebuilt my engine, I was in the same boat (lol). But, never attempted to launch until I installed the after market alternator. I too ran the engine on the trailer, but for a much longer period of time at around 1000-1500rpms. Of course, with muffs and water running. After about an hour and a half, I started to smell unburned fuel vapor coming out of the exaust system, then when I would try and throttle, it would either backfire and or bog with very little power. Also noticed after running this way a few times, the plugs were covered with black carbon. I did this for breakin purposes only and to see if the engine was going to hold together after rebuild being it was the first time I had rebuilt one of the 470's. I am not saying that my battery at that time was up to par but all the same it went flat after about an hour and a half. If you could get a 65 amp marine alternator, you could possibly build a bracket to mount it. But! The problem arises as to allignment issues from the crank pulley to the alternator itself. If you have power steering, then there would be another pulley to figure into the layout. You would have to make sure that the alternator mounting bracket is afixed to the front of the motor securely. You could probably copycat and fabricate but the question arises as to which one you copycat. Dont forget that the block is aluminum. The timing cover is aluminum. There have been posts about guys making there own brackets but shortly after a few months posted about broken timing covers, pulled threads, problems,problems,problems. (mostly home made brackets but not all) Some problems may have been caused by simply a poor design and some because of improper torque at the front of the motor and also misallignment of pulleys causing vibration. Breezeworks 470 talk sells an alternator kit. Talk to Kevin, the moderator. Breezeworks 470 talk is a forum dedicated towards the 470 owners and there are some great people that are willing to help you. Not forgetting this site either! These guys are great too! Whatever you decide to mount up, just make sure you take a straight edge across the front of all pulleys after installation so you are not running crooked with your belt. You will know right away and smell burning rubber if belt is not running true. Your new alternator may also heat up and fail prematurely if not running true. To tell you the truth, I paid $400 for the one I got and it was fabricated (welded) crooked as a dogs leg. The alternator diode did not work when brand new. A buddy helped me fix the diode problem, but the point is: I was totally dissatisfied with the product and actually had to repair a brand new product to make it work correctly. There are several manufacturers but again you will have to determine what is best for you. Just be careful when installing the kit also. Read all of the directions and follow them to a tee. You'll get it, just takes some time,some work, and of course some money! good luck, Tom
    Last edited by 1973 Browning Marine; 03-30-2012 at 06:41 PM.

  20. #20
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question


  21. #21

    Default Re: Mercruiser 470 stator question

    Hey, it's a start! Alot of Amperage. I don't think you need that much. jmho. I was going the same direction as you when trying to choose a suitable system for my boat. My setup came with a 65 amp. which is overkill on my little boat. jmho again. Some guy was talking about not needing that much power on another site especially for a little boat. For the price, I would say go for it! Delco is alright. just remember, if you are going to eventually buy a kit that does not come with an alternator, it would have to have the same bolt pattern or setup. I think most are the same but don't assume anything. Maybe someone on this site could add to this to save you any bother. Look on ebay under Mercruiser 470 and go through all the parts until you locate the aftermarket alternator kits. There is a high mount setup deluxe package. (that is what I bought) It is expensive, but I really like the mounting assembly. It is strong as heck and there are mounting bolts that attach into the iron head. Like I said, I had problems with my installation but after I debugged everything, it works very well for what I need. I think the place is in Marysville Washington. (Hunn Finn?) After you see it on ebay maybe google the Hunn Finn site. It should come up. Maybe make a deal without alternator. I think the alternator that he provides are pretty much low budget if you know what I am saying? good luck, Tom P.S. I wasn't sure if you had power steering or not? Mine has power assist steering and it will probably make a difference on your selection options.

  22. #22
    Join Date
    Apr 2012
    Location
    SAN DIEGO, CA
    Posts
    22

    Default Re: Mercruiser 470 stator question

    I have twin 470's one has power steering the other now has a delco 55 amp marine 1 wire i found for <$60 new. There was an existing mounting bracket and I bought an adjuster bracket from napa and all is well. I do however still have the existing stators dead ended, thinking if it has no path it makes no power. Am I being dangerous? Does anyone else have their stock charging system abandoned in place?

  23. #23
    Join Date
    Dec 2008
    Location
    Buffalo, NY
    Posts
    78

    Default Re: Mercruiser 470 stator question

    Quote Originally Posted by bobsquatch View Post
    I have twin 470's one has power steering the other now has a delco 55 amp marine 1 wire i found for <$60 new. There was an existing mounting bracket and I bought an adjuster bracket from napa and all is well. I do however still have the existing stators dead ended, thinking if it has no path it makes no power. Am I being dangerous? Does anyone else have their stock charging system abandoned in place?
    I have read about two issues here regarding leaving the 470 stator on the engine following a conversion. One of course is the fact that even though the remaining wires are taped off and dead ended or whatever the potential for a dead short is possible because the stator is still making electricity. Secondly it is recommended that the stator itself be removed. A "PITA" job. If a magnet comes loose from the stator, which is common I guess, it can take out the cover and wipe out your timing marks etc.

    Dennis

  24. #24
    Join Date
    Apr 2012
    Location
    SAN DIEGO, CA
    Posts
    22

    Default Re: Mercruiser 470 stator question

    Thanks Dennis, I plan on removing them when I pull the engines for resealing. Just too hard for me to do in the bilge with 2 engines. (as are the gaskets&seals)

  25. #25
    Join Date
    Mar 2012
    Location
    Clemson, SC
    Posts
    110

    Default Re: Mercruiser 470 stator question

    what kind of boat are you in with two 470s pushing it

  26. #26
    Join Date
    Oct 2011
    Location
    maplevalley WA
    Posts
    7,979

    Default Re: Mercruiser 470 stator question

    Do you have a volt meter if not it would be nice to monitor the charging system. Any motor you can`t pull start should have a working volt/amp guage. In my opinion you will know when to get off the water.

  27. #27
    Join Date
    Apr 2012
    Location
    SAN DIEGO, CA
    Posts
    22

    Default Re: Mercruiser 470 stator question

    I have a 1978 Bayliner Victoria. I bought it when it had the factory charging system installed but the regulators were bad (actually melting). I abandoned (dead ended the system) and put in a single 55 amp marine alternator which has worked well. I still have electrical issues though. When I use the bilge blower it draws excessive current and if I leave the shore power connected the anodes need replaced in a few months. Also, some days it runs great at 40mph plus and others it wont even plane. I believe this to be sticky distributors not advancing. Also it seems to crank slow on either engine when starting. I have no reference though as all my modern vehicles crank much faster. Are the 470's notoriously slow crancker's or do I have an electrical issue? I am only running 2 deep cycle batteries and the system can accommodate 4 so I am missing the starting batteries but I thought 2 deep cycles could handle the job.

  28. #28
    Join Date
    Oct 2011
    Location
    maplevalley WA
    Posts
    7,979

    Default Re: Mercruiser 470 stator question

    Deep cycle batteries are not the best for cranking amps and you should be able to upgrade your alternator but make sure you upgrade the wiring at the same time. You need to determine if the advance curve is correct. Do you have a volt meter do determine if performance is related to battery voltage, maybe it it just a grounding issue pull all the grounds apart and sand them metal to metal. Fully charge the battery and check the voltage with the key off start the engine and check battery voltage after a few minutes at different rpms with all appliances on, fans, lights, radio, pump/s you want no less than .5 volts over battery voltage with everything on.

  29. #29
    Join Date
    Apr 2012
    Location
    SAN DIEGO, CA
    Posts
    22

    Default Re: Mercruiser 470 stator question

    The first thing I did is sand all my battery and starter connections to no avail. (plus they looked pretty good to start with) I will ad starting batteries even though i have two deep cycles I need more. I do have a volt meter and the performance issue seems independent, however the engines will fail in a manor resembling vapor lock and I have yet to determine if that is a voltage issue. (let them sit for 45 min and right back to life. Both engines still crank. I am running the alternator through the existing charging circuits and since I am producing less than factory amperage the wiring should be good. I am going to start simple and drown both distributors with WD40 and see if that loosens them up. Batteries may be past their prime but issues are since they were new. I understand that 55amp alternator is minimalistic but as I mostly use it as a live aboard when I am working out of town I will see about more charging system later. (a bigger alternator on the power steering side.) Thanks for all the help guys, I am famous for overlooking the obvious.

  30. #30
    Join Date
    Oct 2011
    Location
    maplevalley WA
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    7,979

    Default Re: Mercruiser 470 stator question

    Adding a ground from the alternator chassis to the battery- never hurts are you running points ignition conversion to pertronix or hot spark is a good upgrade also.

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