No power from coil pack

Good morning.

Take a test light and test for power on the negative side of the coil with the key on.

Then have someone crank the engine and see if the test light flashes. That will tell me if the module is working.

Roy

When I turn it over with the test light on the negative the light stays solid. Along with the positive.

That means the module is not working.

You need either an ignition module and/or a pickup coil in the distributor.

Roy

No power to my injectors either.

Or fuel pump.

Okay, with the key on, you have no power to the injectors? That comes from the power relay by the fuel pump relay under the hood.

Did you verify no power to the fuel pump?

Roy

Correct. No power to fuel pump or injectors with key on.

I attached a picture of the power relay location.

verify power to the relay with the key on. There should be 2 terminals with voltage.

Roy

I attached an image of the relays. The middle one only has one terminal with voltage. Red wire with green stripe.

The green one is the fuel pump relay. The black is the power relay.

Roy

Okay well the black is the one I tested. The test light only comes on when testing the red wire with green stripe. No other terminals lit up. I’ll get a new relay tomorrow if needed. I’m done working on it for the evening. The truck ran and drove fine until I did the motor swap. Old motor had a broken exhaust manifold.

OK.

Roy

Okay, so I bought a new power relay, now have power everywhere I need it and bought a new coil pack. Have power to coil but no spark coming out of coil.

If you have power to the coil, that means the coil is bad.

Roy

I’ve put three brand new coils in it already.

Okay, that is not good.

Can you test for power to the coil?

Use a test light to the positive side. If you do, then test the negative side. Then have someone crank the engine and see if the test light blinks when you have it connected to the negative terminal.

Roy

Okay, I did that and neither negative or positive blinks. Stays solid while cranking.

Okay, the module is not working.

It could be the distributor pick up in the distributor or the module.

Roy

I’ll go ahead and replace that and if nothing changes I’ll email back. Thanks for all the help.

You are welcome.

Always glad to help.

Roy

So I had the truck running. But it was a little out of time. Now it’s turning over too slow. Replaced starter, new battery, and solenoid and also have the plugs out. Not sure what to do now. Still turns over slow.

Okay, use a voltmeter and test the voltage while someone cranks it. Tell me the voltage.

Roy

The battery voltage?

Correct.

Roy

Okay. Gotta find a voltmeter somewhere because I don’t have one. I’ll reply when I test it.

Sounds like a plan.

Roy

So I borrowed one from a buddy and when he hit the key the voltage dropped to around 8.5.

Not good.

I would clean the cables real good both inside and outside and retest.

Is the battery voltage 12.6 with the engine off?

Roy

12.2, but that should be plenty I think. New terminals too but I’ll redo them and try it out.

12.2 is only 35% of battery capacity. Charge the battery to 12.6 volts and retry.

Roy

I pull started the truck and it fired up as long as I gave it some throttle. But the back of the intake is building up condensation on it and is actually feeling really cold when the motor is running.

Also, it is misfiring like crazy and won’t idle.

One thing at a time.

Did you charge the battery and retest the starting?

Roy