WHEN SHOULD VOLTAGE BE PRESENT AT THE COIL?

1988 Dodge Truck

Tiny

greg_h_69

May, 29, 2012 AT 11:43 PM

Should I have voltage at the coil as soon as the key is on or only when the motor is cranking/running?

FOUND 736 RELATED QUESTIONS

17 Answers

Tiny

ASEMaster6371

May, 29, 2012 AT 11:51 PM

As soon as the key is turned on.

What is the issue?

Roy

Tiny

greg_h_69

May, 30, 2012 AT 11:15 PM

I don't have voltage going to the coil. The pcm has been replaced with a re-manufactured one.I put one on and when that didn't fix it I thought it was bad and exchanged it for another one. It ran for about 20 minutes then started acting up again. No voltage at the coil. I then unhooked the power from the coil and ran a jumper from the battery. Still won't start.

Tiny

ASEMaster6371

May, 31, 2012 AT 12:32 AM

I would look at the ignition switch as the power comes from there not the pcm. If you have your original one, re install it and start from scratch.

Roy

Tiny

greg_h_69

May, 31, 2012 AT 12:46 AM

If it would be that, why won't it start when I run a jumper?

Tiny

ASEMaster6371

May, 31, 2012 AT 1:54 AM

Because the ignition side feeds more than just the coil.

Roy

Tiny

greg_h_69

May, 31, 2012 AT 12:07 PM

I'll try it. Thanks

Tiny

greg_h_69

June, 3, 2012 AT 4:19 PM

I put a new ignition switch in it. Still doing same thing. It will run sometimes. When it dies and won't start still no power to the coil.

Tiny

ASEMaster6371

June, 3, 2012 AT 4:25 PM

Did you test for power to the coil on the positive side?

Roy

Tiny

greg_h_69

June, 3, 2012 AT 4:29 PM

Yes

Tiny

greg_h_69

June, 5, 2012 AT 9:18 PM

Guys keep telling me pick-up coil. Could this be it?

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