Which wire is the "start wire"? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mocwon · 05-04-2005, 08:03 AM

Which wire is the "start" wire on the ignition switch of a '72? It appears to be the purple wire from the wiring diagram but I need to verify.

**StingRay** · 05-04-2005, 10:09 AM

I can't say right now that it's purple at the switch but it's certainly purple at the starter.

**VetteVet** · 05-04-2005, 11:35 AM

My haynes manual shows it to be purple. May I ask why you need to verify?

mocwon · 05-04-2005, 02:54 PM

Quote:

Originally Posted by VetteVet

My haynes manual shows it to be purple. May I ask why you need to verify?

I need to wire up the neutral safety switch to a relay setup provided by Painless Wiring for the TPI harness. This involves splicing into the "start" wire and I want to make sure I get it right the first time. Its all magic to me, but the ECM requires a signal from the neutral safety switch to operate properly and not set a trouble code.

chickenwing · 05-04-2005, 03:04 PM

Are you sure the signal needs to be (+)?

I had this here at work, so I scanned it for ya. 12ga purple

mocwon · 05-04-2005, 04:47 PM

Quote:

Originally Posted by chickenwing

Are you sure the signal needs to be (+)?

I had this here at work, so I scanned it for ya. 12ga purple

The Painless instructions say the "start" wire. I guess I better call them and talk through the instructions. Thanks for the scan!

Longhorn Man · 05-04-2005, 06:29 PM

Instead of splicing, you could cut the plug off the neutral safety switch, (same purple wire) and use femail spaid connectors, and on one of them, you run two wires into the crimp on connector. One being the purple, and one being the ECM wire.

mocwon · 05-05-2005, 11:56 AM

Quote:

Originally Posted by Longhorn Man

Instead of splicing, you could cut the plug off the neutral safety switch, (same purple wire) and use femail spaid connectors, and on one of them, you run two wires into the crimp on connector. One being the purple, and one being the ECM wire.

Yeah, that's exactly what I plan to do. I think their instruction are fairly generic since it is for non-GM columns as well.

chickenwing · 05-05-2005, 12:08 PM

Quote:

Originally Posted by Longhorn Man

Instead of splicing, you could cut the plug off the neutral safety switch, (same purple wire) and use femail spaid connectors, and on one of them, you run two wires into the crimp on connector. One being the purple, and one being the ECM wire.

Like the idea but I would keep the connector and just use new terminals.
http://www.americanautowire.com/products/Connectors.cfm

**VetteVet** · 05-04-2005, 10:34 PM

Why can't you just wire to the s terminal on the solenoid, its the same wire .

05-04-2005, 08:03 AM	#1
mocwon Keep On Truckin' Join Date: Mar 2003 Location: Buda, Texas Posts: 1,354	Which wire is the "start wire"? Which wire is the "start" wire on the ignition switch of a '72? It appears to be the purple wire from the wiring diagram but I need to verify. __________________ Just Passin' Thru Some projects are like herding cats; others are like putting out fires; this one was like herding cats on fire.....

05-04-2005, 10:09 AM	#2
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	I can't say right now that it's purple at the switch but it's certainly purple at the starter. __________________ Saskatoon, Saskatchewan Canada

05-04-2005, 11:35 AM	#3
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	My haynes manual shows it to be purple. May I ask why you need to verify? __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

05-04-2005, 03:04 PM	#5
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	Are you sure the signal needs to be (+)? I had this here at work, so I scanned it for ya. 12ga purple __________________ The truck... you hear that? No really, you did hear that?!!! Last edited by chickenwing; 05-04-2005 at 03:53 PM.

05-04-2005, 10:34 PM	#10
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Why can't you just wire to the s terminal on the solenoid, its the same wire . __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

05-04-2005, 06:29 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Instead of splicing, you could cut the plug off the neutral safety switch, (same purple wire) and use femail spaid connectors, and on one of them, you run two wires into the crimp on connector. One being the purple, and one being the ECM wire.



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