The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Electrical

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-13-2021, 08:21 PM   #1
bhap
Senior Member
 
bhap's Avatar
 
Join Date: Mar 2006
Location: Pittsburgh, PA
Posts: 242
Re: Wiring for Alternator, HEI, Lights, Fuel Pump

On the HEI, I think the idea is to use a relay to interrupt the Positive feed to the HEI instead of grounding the tachometer. On points ignitions, it's ok to ground the coil to kill engine momentarily so overdrive can disengage for the "kick-down".

Christian, do you know if the resistor wire is only on the engine side of the firewall connector? I'm thinking of installing a regular wire on the engine side to trigger my HEI relay.

On the fusible link, that is a good idea to use a 16 gauge since the wires on the inside of the connector are most likely 12 gauge.

Thanks for the help, I'm going to get started wiring this up.
bhap is offline   Reply With Quote
Old 06-13-2021, 09:31 PM   #2
cwcarpenter98
Senior Member


 
cwcarpenter98's Avatar
 
Join Date: Jan 2018
Location: Hickory Flat, GA
Posts: 4,430
Re: Wiring for Alternator, HEI, Lights, Fuel Pump

Quote:
Originally Posted by bhap View Post
On the HEI, I think the idea is to use a relay to interrupt the Positive feed to the HEI instead of grounding the tachometer. On points ignitions, it's ok to ground the coil to kill engine momentarily so overdrive can disengage for the "kick-down". That's a much simpler way of saying what I was trying to say above. Yes, that is the idea.

Christian, do you know if the resistor wire is only on the engine side of the firewall connector? I'm thinking of installing a regular wire on the engine side to trigger my HEI relay. On my truck, yes, that was the case. I pried the connector off the resistor wire and reattached the connector to a new wire that I ran directly to the power terminal of the HEI. I did the HEI before I found the overdrive. I didn't have a proper HEI power and tach plug, so I just used an insulated crimp terminal. It worked well to swap over to the HEI relay when I added that in.
My responses in green
__________________
Christian Carpenter

1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive
Overdrive wiring here
1963-ish truck bed trailer - Half-Wit

1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed

1995 Dodge Dakota Sport

"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
cwcarpenter98 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:49 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com