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  1. S

    What does HEI / D.U.I. replace

    I tested the switch last week and it seemed to be 100% good, but the wiring could always be wonky. I'll probably have time to look over everything today
  2. S

    What does HEI / D.U.I. replace

    Awesome, this is great! I have a few more things to test!
  3. S

    What does HEI / D.U.I. replace

    It sure looks factory, but I could be mistaken. There is a bracket and moulded metal tubes connecting it. And that's what I said before, when I turn the key to Run, then test the coil with a multi meter, I get zero volts. About 1 in 10 times I will get 12v and it will start. I just checked my...
  4. S

    What does HEI / D.U.I. replace

    Not sure about SN, but its a Mercruiser 4.3LX with the TB 4. It's out of a 92 Chaparral
  5. S

    What does HEI / D.U.I. replace

    I think the key switch is the only thing I haven't taken a good look at. I know when I turn the key the fuel pump kicks on every time, so I just assumed the key was fine. Are there multiple contacts/power lines coming from the key? And from my understanding, the fuel pump isn't supposed to be on...
  6. S

    What does HEI / D.U.I. replace

    Ok, so I'm having some intermittent spark issues (coil seems to only receive power once out of every 10 key turns or so and will cut out after driving high rpm after a minute) If I switched to a D.U.I. HEI distributor, does the replace the entire Thunderbolt IV system? Are you really trading...
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