2003 silverado 2nd ignition

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Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=95804
Printed Date: May 10, 2025 at 10:21 AM

Topic: 2003 silverado 2nd ignition

Posted By: stratorider
Subject: 2003 silverado 2nd ignition
Date Posted: July 21, 2007 at 3:15 PM

Bear with me hear guys, but I have a duh question. The second ignition wire (white) will test 12 volts while the engine is cranking, yes? Just had a brain fart. Want to make sure I hook this up the right way.

Replies:

Posted By: ferretvw
Date Posted: July 21, 2007 at 4:20 PM

Most of the time yes an ignition will show 12V during run and crank. However it is a Chevy so anything is possible, your best bet is going to be to test the wire with a meter. Hope this helps.

--->Richard

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2008 Scion xB
Pioneer AVIC-D3
RF 3Sixty.2 sound processor
Stock speakers (for now ;))

Posted By: KarTuneMan
Date Posted: July 22, 2007 at 12:35 AM

Second ignition will test one of two ways. It will test with the key switch in run position only, or will test just like main ignition. Like main ignition, it will never show power in the accessory position. If the second ignition shows power only in the run position then the accessory output of a remote start device may be used to power the wire.

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Posted By: Chris Luongo
Date Posted: July 22, 2007 at 12:40 PM

The white second-ignition wire on that truck will actually show power in three key positions: Accessory, Run, and Start.

It will show power the very moment you start to turn the ignition key. It powers up BEFORE anything else.

Anyway, yes, make VERY sure that you power up this wire as Ignition 2-----it needs to see power in BOTH Run and Start. If not, the transmission could be damaged.

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