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Recent content by 91stingray

  1. 9

    Mercruiser 454 Mag random stalling and won't start back up after stalling.

    I checked my main harness it does not have a hose clamp, I didn't unplug the harness and check the connections.
  2. 9

    Mercruiser 454 Mag random stalling and won't start back up after stalling.

    It kind of looks like a hose clamp the main harness plus looks like a 7 pin trailer plug, not literally just the size and shape.
  3. 9

    Mercruiser 454 Mag random stalling and won't start back up after stalling.

    Hi everyone, I'm having a stalling and not starting issue with my carbureted 7.4 mag. It has a Rochester 4 barrel, Thunderbolt 4 Ignition, and is all stock. So it happened the first time last week on the boat ramp, while still strapped to the trailer but in the water enough to suck water, it...
  4. 9

    1991 Mercruiser 7.4L Alternator/ wiring issues.

    It's just a 23' stingray 698svx runabout with a small cuddy. It's a cool little boat, just wish it had more dead rise and stand-up bolster seats. The only upgrades I plan on doing is a single 5 channel amplifier, 4 new speakers and a subwoofer. nothing crazy, Looking to stay under 800 watts.
  5. 9

    1991 Mercruiser 7.4L Alternator/ wiring issues.

    unfortunately i don't have a west marine anywhere near by but the local marina has a fairly well stocked parts department which is where i got the pre-assembled 3 foot length battery cables that I used, I'm assuming it's marine grade, it has tinned lugs and sealed pretty well. He just didn't...
  6. 9

    1991 Mercruiser 7.4L Alternator/ wiring issues.

    Do i just clamp the meter to the output cable of the alternator? And I did forget to clean the ground for the alternator since it's on the starter side of the engine. everything I cleaned and replaced is on the alternator side. I wanted to replace the 4 gauge wire going from the battery...
  7. 9

    1991 Mercruiser 7.4L Alternator/ wiring issues.

    is there a way test the amp output without cutting any wires? it also appears that the orange output wire and ground from the alternator is only a 10 gauge wire. Seems a little thin, but it's also a low amperage alternator. It's actually only 55 amp not 65. I don't think the batteries are bad...
  8. 9

    1991 Mercruiser 7.4L Alternator/ wiring issues.

    I was having issues with my old alternator getting hot while not under any load, it was getting to over 300*f. So I purchased a brand new mando 65amp alternator identical to the one that was on the engine. I also replaced the battery cables and grounds with 2 gauge and 4 gauge wire from a...
  9. 9

    7.4 mag won't start.

    The boat is not at my house currently so I have to wait until Saturday to check it with the amp meter. And im not really interested in trying to find someone that can test it for me, because i only have weekends to work on the boat and id like to resolve this issue this upcoming weekend so i can...
  10. 9

    7.4 mag won't start.

    I'm curious to know if it is possible for a bad battery to appear good and continue to charge and hold normal voltage, but cause the alternator to overheat? I know one of the batteries went for a ride last year amd was tipped over in the engine compartment after hitting a big wave. It looked...
  11. 9

    7.4 mag won't start.

    Does that only function as an alarm or does it short out the ignition if it gets to hot?
  12. 9

    7.4 mag won't start.

    I have 2 sensors on my thermostat housing. Is one of them there to prevent the engine from starting if it gets too hot? I pulled the nee thermostat out and found that it was stuck when trying to push it open with a screwdriver. But ran the engine without the thermostat and it seemed to run...
  13. 9

    7.4 mag won't start.

    My multimeter was giving false readings I replaced it and my voltage is 14v while running, and batteries are at 12.5v when engine is off. I'm going to borrow a amp meter from someone and see what the alternator is putting out. If it's pushing max amps I need to figure out why. im hoping it's...
  14. 9

    7.4 mag won't start.

    Multimeter it was faulty and I got a new one. My voltage is reading normal, but the alternator is still getting way to hot and putting of a burning smell.
  15. 9

    7.4 mag won't start.

    The engine is raw water cooled with pickup tube mounted at the bottom of the transom. The impeller seems to be working fine as I was using only the suction from the pickup tube with a hose in a 55 gallon drum to suck water. And plenty of water was coming out of the exhaust.
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