Starter Trigger Wire -Purple
Thread Starter
Staging Lane
Joined: Oct 2009
Posts: 52
Likes: 0
From: Minneapolis Mn
Starter Trigger Wire -Purple I have read that you are supposed to connect up the purple wire to the starter solenoid on the LS1 harness.
You also have the existing car harness with its own starter solenoid wire that goes hot in key start position.
The question is does the LS1 harness purple wire provide anything to the starter, or is it taking a feed from the 12V start signal to signal the PCM to perform a start routine?
My plan would be to have both connected to the starter solenoid connection, figuring that I would be covered either way. Anything wrong with that idea?
You also have the existing car harness with its own starter solenoid wire that goes hot in key start position.
The question is does the LS1 harness purple wire provide anything to the starter, or is it taking a feed from the 12V start signal to signal the PCM to perform a start routine?
My plan would be to have both connected to the starter solenoid connection, figuring that I would be covered either way. Anything wrong with that idea?
that should be fine. if you trace the purple solenoid wire in the ls1 harness out to the other end it terminates at the fuse box starter relay. as long as the relay is intact in the swap car, its solenoid wire should function. thats what i am using on my swap, the purple wire from the old cars harness. i just deleted the purple wire from the lsx harness.
Thread Starter
Staging Lane
Joined: Oct 2009
Posts: 52
Likes: 0
From: Minneapolis Mn
that should be fine. if you trace the purple solenoid wire in the ls1 harness out to the other end it terminates at the fuse box starter relay. as long as the relay is intact in the swap car, its solenoid wire should function. thats what i am using on my swap, the purple wire from the old cars harness. i just deleted the purple wire from the lsx harness.
Staging Lane
Joined: Feb 2020
Posts: 79
Likes: 1
Bringing this thread back. I'm in the same situation, but not sure what to do. I've got a 5.3 truck motor, I followed the harness conversation from LT1Swap.com on Youtube, and now I have this purple wire left. He says to conect it at the starter. Does it go to the small stud on the starter with the other wire in the harness? Or does it get left in the harness and not hooked up?
Bringing this thread back. I'm in the same situation, but not sure what to do. I've got a 5.3 truck motor, I followed the harness conversation from LT1Swap.com on Youtube, and now I have this purple wire left. He says to conect it at the starter. Does it go to the small stud on the starter with the other wire in the harness? Or does it get left in the harness and not hooked up?
Staging Lane
Joined: Feb 2020
Posts: 79
Likes: 1
The small stud on the solenoid is the ignition cranking terminal. You can use your existing wire or eliminate it and use the purple wire to tie to ignition. You've lost me on the other wire? There should not be any other wire on the solenoid terminal. Starter should have main battery HOT large terminal and small stud on solenoid to energize it.
now that I'm thinking about it, is the Purple wire the same wire that is already connected to the small terminal? That goes to the ignition?
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Teching In
Joined: Nov 2019
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Yes it is. In my application it goes to the ignition switch. My application is in a 1969 Chevy truck. I tied into the purple wire on the original LS wiring harness and then ran it to my ignition switch. Starts fine. Hope this helps. I redid my harness per the LT1 Website and Brendens video
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Staging Lane
Joined: Feb 2019
Posts: 72
Likes: 13
I'm pretty sure that wire is just a wire that runs within the harness and is, for all intents and purpose, just a single independent wire nothing to do with the pcm. You don't have to use it but it makes for a neater wiring job as long as you can find the other end to hook to your ignition start.
Staging Lane
Joined: Feb 2020
Posts: 79
Likes: 1
Now I'm having a brain block... my ignition switch is a 4 post, it says Bat, ACC, IGN, SOL.
Bat is 12v+ from the battery
ACC is 12v+ key hot assories
ING ??
SOL ??? ( purple wire that goes to the starter solinode ? )
sorry for the stupid question...
Bat is 12v+ from the battery
ACC is 12v+ key hot assories
ING ??
SOL ??? ( purple wire that goes to the starter solinode ? )
sorry for the stupid question...
Bat is Battery +
ACC is accessories position, usually key turned backwards - great for radio so other acc aren't on.
Ign is ignition hot - Key turned forward one click to power everything on
SOL is cranking power to starter- This is the small hot wire from key to starter to crank. Your purple wire that's on the small terminal on solenoid would go here.
ACC is accessories position, usually key turned backwards - great for radio so other acc aren't on.
Ign is ignition hot - Key turned forward one click to power everything on
SOL is cranking power to starter- This is the small hot wire from key to starter to crank. Your purple wire that's on the small terminal on solenoid would go here.
Last edited by 1964SS; Mar 4, 2020 at 08:02 AM.
