HEI Ignition Wiring - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 8 (permalink) Old Apr 20th, 16, 9:54 PM Thread Starter
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Corey
 
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HEI Ignition Wiring

Hey guys

The wiring on my car is all screwed up. Im also removing the tape on the front wiring harness to inspect everything. Does anyone have a diagram for a 66 chevelle that shows the wiring for a HEI Ignition? Also just to make sure with using a HEI does that eliminate the voltage regulator? Im asking because someone cut the connector off the harness for the regulator. I would also like to remove it to clean things up In the compartment.
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post #2 of 8 (permalink) Old Apr 21st, 16, 2:00 AM
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Ed
 
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Re: HEI Ignition Wiring

the wiring diagrams for a 66 will show the breaker points ignition system in its stock form as HEI was not avail til '78 (as per my Chilton's 64-88 mid size Chevy repair manual) . HEI will not effect whether your charging system is externally regulated (originally) or internally regulated (came later on). my advise is if all is working ok just tidy up the wires/what's needed and be done with it. if anything is wrong or you suspect something post the issue for further assistance.
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post #3 of 8 (permalink) Old Apr 22nd, 16, 12:19 AM Thread Starter
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Corey
 
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Ok great. So basically the OEM stock voltage regulator is replaced by the Hei unit? My car doesn't the voltage regulator it's missing all together
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post #4 of 8 (permalink) Old Apr 22nd, 16, 12:57 AM
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mike
 
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Re: HEI Ignition Wiring

No, he is telling you the oem wiring diagram will not show the HEI .
The HEI High Energy Ignition is your distributor, it has been changed from original.
The voltage reg. is not related to HEI at all.
Your alt. has been replaced with an internal voltage reg. so the external is no longer needed. HTH's
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post #5 of 8 (permalink) Old Apr 22nd, 16, 2:02 PM Thread Starter
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Corey
 
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Now I understand!! Thank you!
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post #6 of 8 (permalink) Old Apr 22nd, 16, 8:03 PM
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Re: HEI Ignition Wiring

Your '66 will have a resistor wire going directly to the positive side of the coil. Stock points need the voltage to drop so they don't burn out. That wire is Yellow & should have a cloth sheath. You should cover that wire terminal with harness wrap or heat shrink & zip tie it out of the way in the rear of the block.

In order to run the HEI, you'll need to run a new 12g wire from the fuse box directly to the positive terminal of the HEI cap. You can solder a female terminal end & heat shrink it so you can side it on the the IGN terminal in the fuse box. You only want it to be hot when the key is in the ON position.

Summit used to sell a wire lead with the proper connector to fit an HEI cap.
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post #7 of 8 (permalink) Old Apr 22nd, 16, 8:21 PM
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Re: HEI Ignition Wiring

Just re-read your post & realized someone cut the regulator connector off the harness. For $130 or so you can buy a new forward lamp harness which will contain the regulator plug & all new headlight connectors, etc.

I think M&H will actually make you an engine harness (i think they are about $120) with the HEI lead already installed. If you're wiring is a mess, two new harnesses are cheap insurance. For just around $250, you'll have peace of mind.
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post #8 of 8 (permalink) Old Apr 22nd, 16, 8:40 PM Thread Starter
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Corey
 
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I actually still have it. I can reinstall if need be. Thanks for the post!
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