No Spark
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New User
Joined: Mar 2014
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No Spark
Pulled truck into shop to work on turn signal/brake lite issues and now truck has no spark. Background…428 with Pertronix distributor and coil, C6. Had replaced the turn signal/steering column harness and had issues getting the new harness plug to connect to the old under dash plug. So I
pulled the pins from the new harness and plugged them directly into the old under dash plug. Turn signal and brake lites work but now no spark. I’ve got power to coil. What could I have “bumped” under the dash to have caused this?
pulled the pins from the new harness and plugged them directly into the old under dash plug. Turn signal and brake lites work but now no spark. I’ve got power to coil. What could I have “bumped” under the dash to have caused this?
More Turbo
Joined: Dec 2019
Posts: 734
Likes: 154
From: Orange County
Since you've already checked power to coil, I would check that your distributor has good continuity to neg side of battery - maybe a ground that was barely keeping things together is the thing that got disrupted.
Did you bang your elbow or head into the ignition switch or it's wires? I'd remove and replace the connector a couple of times to clean the contacts. Have a look at the wires where they connect to things.
Maybe your getting 12V to the coil in the Run position but not in the Start position? - I assume you're checking for spark while cranking, but checking for voltage while simply in the run position - so you could check for voltage at the coil while cranking to see if that changes
Did you bang your elbow or head into the ignition switch or it's wires? I'd remove and replace the connector a couple of times to clean the contacts. Have a look at the wires where they connect to things.
Maybe your getting 12V to the coil in the Run position but not in the Start position? - I assume you're checking for spark while cranking, but checking for voltage while simply in the run position - so you could check for voltage at the coil while cranking to see if that changes
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New User
Joined: Mar 2014
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I’ve checked all the likely under dash sources that I could have disrupted. I have 12v to both sides of coil (10v when cranking) I’ve pulled the coil wire from the distributor and put a spark plug on it to test (grounded the spark plug against the head) and nothing. Replaced the coil and nothing…what am I missing?
More Turbo
Joined: Sep 2019
Posts: 654
Likes: 124
From: Northern Texas
Hmm, bad coil perhaps. I keep a spare.
you might try arcing the tip of the coil wire without using a plug, eliminate one piece of the puzzle and the need to get a good ground with the spark plug.
you might try arcing the tip of the coil wire without using a plug, eliminate one piece of the puzzle and the need to get a good ground with the spark plug.
Fleet Mechanic
Joined: Jun 2019
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From: Southern California
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Cargo Master
Joined: Sep 2005
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"+" side of the coil should be hot, "-" side of the coil should pulsate when cranking, if it stays hot, you have no pulse from your pertronix. I'm not fresh on pertronix wiring, so get a diagram online and check your connections.
to check for pulse, put your test light on the "-" post of the coil and crank it, light should flash.
to check for pulse, put your test light on the "-" post of the coil and crank it, light should flash.
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Tuned
Joined: Aug 2021
Posts: 274
Likes: 63
I don't know if this is the unit you have, but it has a help section and how to hook it to the battery to bypass wiring problems:
https://cdn.shopify.com/s/files/1/02...files/1281.pdf
Petronix systems are fairly simple, but picky. I had to set one up on a motorcycle with dual coils.
Try hooking direct to battery per the help in the instructions.
Good luck,
Tom
https://cdn.shopify.com/s/files/1/02...files/1281.pdf
Petronix systems are fairly simple, but picky. I had to set one up on a motorcycle with dual coils.
Try hooking direct to battery per the help in the instructions.
Good luck,
Tom
Tuned
Joined: Mar 2017
Posts: 255
Likes: 15
"+" side of the coil should be hot, "-" side of the coil should pulsate when cranking, if it stays hot, you have no pulse from your pertronix. I'm not fresh on pertronix wiring, so get a diagram online and check your connections.
to check for pulse, put your test light on the "-" post of the coil and crank it, light should flash.
to check for pulse, put your test light on the "-" post of the coil and crank it, light should flash.
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