Switch Vs. Motor

Printed From: the12volt.com
Forum Name: Car Security and Convenience
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=57118
Printed Date: September 12, 2025 at 3:46 AM

Topic: Switch Vs. Motor

Posted By: swhite005
Subject: Switch Vs. Motor
Date Posted: June 05, 2005 at 7:41 PM

On determining the switch side and motor side of the door lock/unlock wire, I understand that a mutimeter is necessary. Can someone please provide a link or explain how to determine which side it which? If the wire shows power when the switch is pressed, does that mean it is the motor side (considering the wire has been cut in half to install a relay)? Or is it vise-a-versa? Do I touch the positive lead on the multimeter to the wire and the negative to a ground? Please Help!

Replies:

Posted By: mo12v
Date Posted: June 05, 2005 at 8:15 PM

Usually, when U cut the proper Lock / Unlock wires in half, U will have one side that will show voltage << ( + ) or ( - ) depending on vehicle >> when U press Door Switch. That usually is the Switch side. The other side will be motor.
I

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MO

Don't Learn from Others Mistakes
You Might Be the One That Knows.

Posted By: kgerry
Date Posted: June 06, 2005 at 3:49 PM

also, you only need to physically cut a wire if you have a reverse polarity ( 5 wire ) doorlock system..... + or - you can just meter the wire to determine polarity.....

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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

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