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Old 06-27-2012, 08:30 PM
loudandproud loudandproud is offline
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HEI Wiring Problems... stumped...

Here is the deal.

Just got done with putting a carburated sbc in my C1500 chevy pickup. Thing runs great.

For mockup I ran the HEI distributor right off the battery. Got the motor timed for 32* total advance, all in at 3200 rpm. Initial is about 10*.
All was good.

After getting everything buttoned up, it was time to go back and tie up the loose ends.

I decided to hook the HEI up to a keyed- hot wire.

After doing this, the motor would start and run fine, but after I turned the key off, the dash lights would stay on, and the motor would keep running. To shut the motor off I would have to go out and unplug the Keyed hot wire from the BAT terminal on the HEI. As soon as I did this, the motor would shut off and the dash lights would turn off.

Hmmm. Interesting. Checked the keyed hot again... sure enough... when unplugged from the dizzy it acts as expected. Key on: 14.1v+ , Key off: 0volts.

I figured the HEI was back feeding somehow into the wiring, so then i decided to hook it up to a relay.

The coil was then hooked up to a DIFFERENT keyed hot (radio terminal in the fuse block). I then hooked up the common to the battery and the N.O terminal to the BAT terminal on the battery.

Check everything with a voltage tester... all good. Key on: 14.1v+ Key off: 0 volts

Try to start the motor...

This time it cranks and cranks and cranks and then starts chugging. BUT NOT THE GOOD KIND! Fuel starts spraying out of the carberator and the motor is carrying on. Shut the key off and it dies. Acts like the timing is WAY off. The motor was actually bumping of the starter and trying to fire over backwards. Wierd.

Try again... Does the same thing.

Try again... Does the same thing.


I think ... hmmm. I wonder if the cam or dizzy jumped timing.

So I hot wire it back up to the battery. Crank it over... **** you not the first revolution the motor fires right up and runs perfect.

Switched it back to the relay thinking it was a fluke.. nope.

WTF is going on?

Im beyond confused.
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