1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

[FuelishBehavior]

Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

Should I maybe run a hot wire from battery post to coil and try to start? Maybe there's a voltage drop during the turn over phase?

 

[Don S]

Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

Do you have a good ground for the distributor on the block? If the bolt and clamp are loose or on paint, you don't have a good ground. What about the ground wire for the module?

 

[FuelishBehavior]

Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

Also, does the module amplify the coil output at all? It does seem like the spark is weak inside of my inline tester. It's orange. Maybe on the bench with a battery and a charger hooked up to it, at 12.7 volts it's enough to fire. Since in the boat, it's closer to 11.9 to 12.0 at the coil and that's not making the module fire properly because it is old? I'm reaching here!

 

[Don S]

Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

11.9 to 12.0 is considered a dead battery. Charge it up.

 

[FuelishBehavior]

Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

There is no ground wire on my module. It has 4 wires coming out of it. Red/White, Green/White, Gray and Purple. Unless the gray one is ground and it goes to the negative side of the coil. That might answer a lot of questions if there's a wire missing out of my harness?

 

[FuelishBehavior]

Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

And I just wouldn't think it'd be considered dead because it sure spins the hell outta the starter.

 

[Don S]

Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

Gray is tachometer.
Does your module mount to the distributor or the exhaust elbow.