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  I think my signal wire for ignition module and ignition coil grounded out

Tiny
DAVISMELODY6669
  • MEMBER
  • 1996 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
I used a test light to the white wire and it did not light up. How can I make it ungrounded? I have no spark. My truck only turned on once idle strong and then I tried to turn on again and nothing, no spark?
Sunday, January 5th, 2020 AT 8:43 PM

12 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Do you mean the wire on the negative side of the coil?

Did you verify power on the positive side?

Roy
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Monday, January 6th, 2020 AT 3:13 AM
Tiny
DAVISMELODY6669
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Using test light for the module I have feed and ground with key on, but when key on the white wire the signal I have no light. Clip on +battery pointing to white wire light is on, turn the key and light goes off for both module and coil connection. Is that normal?
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Monday, January 6th, 2020 AT 9:14 AM
Tiny
ASEMASTER6371
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Put the clip on the ground on the battery. Test for power on both sides of the coil. Then crank the engine. The test light should flash on the negative side of the coil while cranking.

Roy
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Monday, January 6th, 2020 AT 9:18 AM
Tiny
DAVISMELODY6669
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  • 65 POSTS
Crank and test for power feed and test the other wire that comes from the module? White and black wire? I ignore the white wire the tachometer.
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Monday, January 6th, 2020 AT 10:32 AM
Tiny
ASEMASTER6371
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Yes. Test the white black wire to see if the module is working.

Roy
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-1
Monday, January 6th, 2020 AT 10:39 AM
Tiny
DAVISMELODY6669
  • MEMBER
  • 65 POSTS
I tested the feed on both both coil and module light stay on. Checked ground light stayed on. Checked the white/black wire to them n light stood on. And the clip was hook to (-) battery. They all got little almost nothing dim because of the amp of the starter.
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Monday, January 6th, 2020 AT 11:11 AM
Tiny
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If the light does not flash, the module is the issue and needs to be replaced.

Roy
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Monday, January 6th, 2020 AT 11:55 AM
Tiny
DAVISMELODY6669
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  • 65 POSTS
I replaced it four times already
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Monday, January 6th, 2020 AT 12:31 PM
Tiny
DAVISMELODY6669
  • MEMBER
  • 65 POSTS
Within 2 weeks
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Monday, January 6th, 2020 AT 12:31 PM
Tiny
ASEMASTER6371
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What brand and were are buying them?

Roy
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Monday, January 6th, 2020 AT 1:29 PM
Tiny
DAVISMELODY6669
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Duralast from AutoZone :(
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Monday, January 6th, 2020 AT 3:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Ask them to upgrade you to an AC/Delco. Make sure you use the dielectric grease on the muntings.

Then retest the system.

Roy
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Monday, January 6th, 2020 AT 3:35 PM

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