12v+ Keyed IGN source that is also hot while cranking - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 02-16-2017, 02:08 PM Thread Starter
 
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12v+ Keyed IGN source that is also hot while cranking

So I'm looking for a wire that is hot while key is in the "ON" and "START" position while cranking. I did an LS Swap and the computer loses 12v while cranking so it won't start unless wired to 12v constant. I've tried all of the wires at the ignition switch and couldn't find one. Same at the extra fuse block spade connectors. It is a 66 tempest originally with 350 and 3 speed auto. Also it's factory dash wiring. Any ideas? Thanks in advance!
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post #2 of 5 (permalink) Old 02-16-2017, 06:12 PM Thread Starter
 
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Since the purple or yellow wire in the ignition switch are "on" while cranking (purple goes to starter, yellow went to ignition coil) I was thinking I could use a relay system (see photo) but I don't know if having feedback into the pink wire would be an issue. I suppose I could install a diode to prevent this. Any thoughts?
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post #3 of 5 (permalink) Old 02-16-2017, 08:48 PM
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You could connect a time delayed relay that will apply 12 volts for a few seconds while you start the engine;

https://www.delcity.net/store/Time-D...FdgegQodUOEB8Q
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post #4 of 5 (permalink) Old 02-17-2017, 11:28 AM Thread Starter
 
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I suppose that could work, but I guess I'm hoping for something a little less elaborate than that. Last night I connected the yellow and pink wire together to and it ended up working to provide power all the time. I'm just worried about feedback into the circuit.
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post #5 of 5 (permalink) Old 02-17-2017, 06:15 PM
 
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The coil wire should have 12v anytime the key is on & while cranking
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring

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