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Old 12-05-2018, 07:52 AM
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Wiring Ignition Switch

I would like some input from the group here. I am installing a new wiring harness in my 38 Chevy. I have a pull type ignition switch which is not rated for high current. My plan is to have a 60/80 amp relay for each of the Acc power, Ign power and starter power that is triggered by the switch. All of my high draw systems (electric fan and HVAC are run on dedicated circuits).
I do not see any issues with this setup, but would appreciate any tips or items I may have overlooked.

Thanks, Chris

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Old 12-05-2018, 08:17 AM
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hidden switch

I would install a modern type key switch that was for dash mount in a pickup in the kick panel under your seat. Not have to mess with relays for normal draw circuits. IGN start acc..
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Old 12-05-2018, 04:41 PM
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Quote:
Originally Posted by silver74vette View Post
I would like some input from the group here. I am installing a new wiring harness in my 38 Chevy. I have a pull type ignition switch which is not rated for high current. My plan is to have a 60/80 amp relay for each of the Acc power, Ign power and starter power that is triggered by the switch. All of my high draw systems (electric fan and HVAC are run on dedicated circuits).
I do not see any issues with this setup, but would appreciate any tips or items I may have overlooked.

Thanks, Chris
This will work fine. This is exactly how GM wired high current accessories like power windows on their 1960s cars. The isolation relay only allowed the accessories to be powered when the key was in ACC or RUN, and the use of the isolation relay kept the high current out of the ignition switch.
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Old 12-07-2018, 07:55 AM
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Appreciate the feedback guys!
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Old 12-07-2018, 08:00 AM
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Ignition switch

FYI the Flaming river column that has the key in the column is wired just like that (with relays). Some research and ask around and you may be able to come up with their wire diagram which will back up what you already know but will make you feel warm and fuzzy!
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Old 12-10-2018, 12:48 PM
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Thanks, I did all the soldering this weekend and have the fuse block in the car. The key type switches I was looking at were rated at 30 amps, the relays are double that and the wires are much shorter so I think it's better overall. Now I just need to run all the wiring through the car.
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