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  1. S

    Need Help Please!!! Cranks low spark out of coil.

    Solved!!! I cut the white tach wire off of the 3 wire coil plug and it lit right up! It must have been getting power from somewhere in the harness causing the coil not to fire. Thanks for everyone's help!
  2. S

    Need Help Please!!! Cranks low spark out of coil.

    Sorry Battery negative (B-)
  3. S

    Need Help Please!!! Cranks low spark out of coil.

    Thanks for the explanation. So with key on should I see voltage to the white wire with B-? The truck is currently a crank/ no start condition. I appreciate the help
  4. S

    Need Help Please!!! Cranks low spark out of coil.

    I got the truck back and poked a little bit yesterday. I noticed that the white coil wire has 8.6v. My understanding is that the white wire is connected to white/black wire and goes to the tach. I thought that should be a negative signal from the ICM to fire the coil. What am I missing here...
  5. S

    Need Help Please!!! Cranks low spark out of coil.

    I will definitely check the grounds thoroughly when I get the truck back. It seems to always be a ground
  6. S

    Need Help Please!!! Cranks low spark out of coil.

    The 'pros" don't work for free. I agreed to a minimum check out time. Unfortunately, I have nothing to show for it. Replace the engine harness and ECM with an aftermarket one was their recommendation....with no guarantees.
  7. S

    Need Help Please!!! Cranks low spark out of coil.

    12 volts without the battery charger on. 13.4v with it on. 10.4v while cranking. Thanks for the reply.
  8. S

    Need Help Please!!! Cranks low spark out of coil.

    A few New from parts store and known good from old 5.7l. No change. I did ohm the old good one.
  9. S

    Need Help Please!!! Cranks low spark out of coil.

    Please! Please! I have a 96 C1500 auto with a swapped L29 7.4l engine. It had a L31 prior. I have read multiple threads and scoured the web to no avail. I cannot get this thing to start. Here is what is going on: Turns over (cranks) over just fine ICM has 12v power, ground and ECM signal Have...

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