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#1 |
Registered User
Join Date: May 2022
Location: WA
Posts: 18
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No spark
Driving along, truck just shuts off.
Cranks, but won’t start. It’s a 72 with a 350 and HEI Distributor. Put on spark tester, nothing. Jumper wire from HEI to + battery terminal, starts right up. Put in a new ignition switch, nothing. Typical hot mess of wiring from previous owners. Any ideas? |
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#2 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,081
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Re: No spark
Time to get out the voltmeter and see if/why no power is getting to the HEI. It isn't time to randomly swap parts such as the ignition switch.
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#3 |
Registered User
Join Date: May 2022
Location: WA
Posts: 18
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Re: No spark
Like what and how? I am an electrical idiot. I have a volt meter, but I don’t even know what setting it should be on.
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#4 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,081
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Re: No spark
google.com
How do I use a voltmeter? What is Ohms Law? How do I TS an ignition issue? How do I troubleshoot? The internet will provide a million responses in a tenth of a second. Why are you waiting hours for the rest of the world to imagine what the trouble is? Electrical circuits are simple. Current goes from the source back to where it came from. Saying you're an electrical idiot isn't an excuse. You have a problem and want to solve it. Do so. Trace the lack of voltage back to where it stops being supplied. Last edited by franken; 06-10-2024 at 01:23 AM. |
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#5 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,554
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Re: No spark
Unless you have lots of money for random new parts, this IS a good time to learn how to use that Volt meter.
Your jumping +12 from the battery did remove failure of the HEI dizzy from the mix. Trace the normal power wire back from the dizzy to where ever it goes. Does it now have +12v? Maybe a splice from a PO came loose. Or mouse activity. Also possible whoever swapped in the HEI used the old coil resistor wire to power the HEI and it finally quit working on the lower voltage. They want full battery power. Under the dash possibilities are loose wires and bad/out of adjustment Neutral Safety Switch. |
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#6 | |
Registered User
Join Date: May 2022
Location: WA
Posts: 18
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Re: No spark
Quote:
I don’t, I do have time. I did trace it back, the truck has a Tach, wire going to distributor is Brown and it goes to the back of the Tac hand then it has a V shaped plug that goes to a spliced connector to the fuse box into the “unfused” slot. The tach was acting wonky the last few times I drove it, bouncing around instead of holding steady. Thanks for the reply. |
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#7 | |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,721
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Re: No spark
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#8 | ||
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,163
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Re: No spark
Quote:
Quote:
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#9 |
Senior Member
![]() Join Date: Dec 1999
Location: Southern California
Posts: 2,810
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Re: No spark
An old school ignition kill/antitheft is to ground the tach wire. Make sure yours is not grounding out while driving.
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