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HEI power supply

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Old Nov 23, 2013 | 05:48 PM
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Default HEI power supply

Hi guys,
I am trying to find a good power source for my new HEI ignition that I added to my 1970 vette. I'm sure others have done this and was hoping for some good suggestions as to where to pick up power.
Thanks,
Rob
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Old Nov 23, 2013 | 08:42 PM
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You can plug right into the fuse box marked ign.
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Old Nov 23, 2013 | 09:37 PM
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Originally Posted by '75
You can plug right into the fuse box marked ign.


If you really want to go all out, Lectric Limited has an HEI wire with the connector to the HEI on one end and the spade for the fuse box on the other.
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Old Nov 23, 2013 | 09:46 PM
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I would try to use the power wire for the original distributor .
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Old Nov 23, 2013 | 09:56 PM
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Originally Posted by garygnu
I would try to use the power wire for the original distributor .
The original is a resistor wire he needs full 12 volts.
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Old Nov 24, 2013 | 12:51 AM
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Originally Posted by '75
You can plug right into the fuse box marked ign.
I already have two other items on that terminal. The stereo and I believe the alarm. Do I need to find other locations for them or can I piggy back that on there also?
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Old Nov 24, 2013 | 01:46 AM
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Use a relay and get the power from the horn junction, signal from the original.
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Old Nov 24, 2013 | 07:54 AM
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Originally Posted by vetteguy22
I already have two other items on that terminal. The stereo and I believe the alarm. Do I need to find other locations for them or can I piggy back that on there also?
Stereo and other accessories are best on the acc terminal because they are not active when the key is turned to start. This saves battery power for getting the engine started. While starting, ign is powered, acc is not, when the key is on, both are powered.
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Old Nov 24, 2013 | 08:29 AM
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Originally Posted by '75
Stereo and other accessories are best on the acc terminal because they are not active when the key is turned to start. This saves battery power for getting the engine started. While starting, ign is powered, acc is not, when the key is on, both are powered.
Like they said--DON'T add any other devices to the same connection that supplies 12V to the HEI AND don't use the original coil resistor wire because it keeps the HEI from putting out max spark.

If I can't find a "loose" wire in the engine bay from years of electrical devices being "done away with"......I'm going to use the other members advice of adding a white "12V with the key on" spade wire from the fuse-box thru the firewall to the distributor.

Also.......the other member's idea of using the original supply resistor wire to trigger a new relay would work....a little more work involved, but a good idea!

Last edited by doorgunner; Nov 24, 2013 at 09:07 PM.
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