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When should voltage be present at the coil?

Tiny
GREG_H_69
  • MEMBER
  • 1988 DODGE TRUCK
  • 130,000 MILES
Should I have voltage at the coil as soon as the key is on or only when the motor is cranking/running?
Tuesday, May 29th, 2012 AT 11:43 PM

17 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
As soon as the key is turned on.

What is the issue?

Roy
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Tuesday, May 29th, 2012 AT 11:51 PM
Tiny
GREG_H_69
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  • 14 POSTS
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.
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Wednesday, May 30th, 2012 AT 11:15 PM
Tiny
ASEMASTER6371
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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
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Thursday, May 31st, 2012 AT 12:32 AM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
If it would be that, why won't it start when I run a jumper?
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Thursday, May 31st, 2012 AT 12:46 AM
Tiny
ASEMASTER6371
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Because the ignition side feeds more than just the coil.

Roy
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Thursday, May 31st, 2012 AT 1:54 AM
Tiny
GREG_H_69
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  • 14 POSTS
I'll try it. Thanks
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Thursday, May 31st, 2012 AT 12:07 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
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.
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Sunday, June 3rd, 2012 AT 4:19 PM
Tiny
ASEMASTER6371
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Did you test for power to the coil on the positive side?

Roy
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Sunday, June 3rd, 2012 AT 4:25 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
Yes
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Sunday, June 3rd, 2012 AT 4:29 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
Guys keep telling me pick-up coil. Could this be it?
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Tuesday, June 5th, 2012 AT 9:18 PM
Tiny
RASMATAZ
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You need to fix the power problem to the coil-the distributor pick-up coil is not gonna operate
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Tuesday, June 5th, 2012 AT 11:31 PM
Tiny
GREG_H_69
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  • 14 POSTS
The pick-up coil sends a signal to the pcm telling it when to send power to the coil and the injectors. I replaced it 2 days ago, runs great now.
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Friday, June 8th, 2012 AT 10:28 PM
Tiny
RASMATAZ
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We know that-The distributor pick-up coil controls the coil and injector-been here before-Your welcome
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Friday, June 8th, 2012 AT 10:37 PM
Tiny
GREG_H_69
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Read what you wrote on June 5.
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Saturday, June 9th, 2012 AT 3:40 PM
Tiny
RASMATAZ
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I was giving you a hint-So what's the problem here
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Saturday, June 9th, 2012 AT 4:00 PM
Tiny
GREG_H_69
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"You need to fix the power problem to the coil-the distributor pick-up coil is not gonna operate" Looks to me like that answer says the pick-up coil is not the problem.
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Saturday, June 9th, 2012 AT 5:41 PM
Tiny
RASMATAZ
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Oh! Well you got it fixed-Good Luck
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Saturday, June 9th, 2012 AT 9:18 PM

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