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Recent content by Wakerider000

  1. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Not sure why photos are not uploading right. Found an 18 pitch SS last night on eBay for $125 ordered it and at least have a closer idea. I was considering putting a 5.7 mercruiser in as they can be had for 5-6k. Not sure if they’ll fit though. And plate on transom says 220hp MAX. (Not sure...
  2. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Kghost tagging you in hopes you see this Thanks:))
  3. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Okay went to the lake Saturday. Here’s my current findings. Serial number on drive is 0F193143 Haven’t found engine serial# yet. Ratio appears to be 1.6:1 Every revolution of the crank gives just over half a turn on prop. Fuel filter definitely says “for engines under 115 hp” thinking this is...
  4. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Alright thanks for the suggestions might be a week till all that gets done. But I’ll see what I find. Boat was kept at a lake on the PA/NY border.. I’m in Harrisonburg VA. They bought it early 2000s. So there was a previous owner that I don’t know.
  5. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Actually one other thing. Hour meter is a gauge dangling from engine in engine bay. At this point guessing boat was re powered which opens a new can of worms. Potentially mismatched drive etc.
  6. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Dropped it in water this morning with tach working and I’m getting 3800-4000 rpm. looks like somebody jerryrigged a Yamaha marine fuel filter setup into it. Not entirely sure it’s big enough as some of the replacement filters say “for under 115 hp”. Usual filter issues give rough running in...
  7. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Added a wire to the neg side of coil and tach now works. Now to drop it in water and see what RPM I’m running. Not expecting boat to be a race boat but really think it should do better than 33. Haven’t pulled wakeboarder yet but not sure if it’ll pull a 220 lb guy up. I already have to send...
  8. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Thanks for the quick reply and diagram Kghost! I’m going to try adding a wire from neg side of coil to gray tach wire on harness. Hopefully that don’t fry anything. Everything else looks right on the diagram. mine is missing. Will do that today and update.
  9. Wakerider000

    Merc 4.3 thunderbolt ignition tach issue

    Hi, trying to get my tach working. Bought a 93 maxum w/ 4.3 19’er All online help says tach feed should come from one of two gray wires off neg side of coil. There’s only one grayish yellow wire on neg side of coil and it goes into thunderbolt ignition module. Already replaced tach. Have good...
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