Unlock works - lock does not

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=46712
Printed Date: August 27, 2025 at 7:58 PM

Topic: Unlock works - lock does not

Posted By: mrwhitehat
Subject: Unlock works - lock does not
Date Posted: January 02, 2005 at 8:57 PM

99 Dodge Ram
Marksman M6A Keyless

Status: Unlock works great - both remote and door switch
LOCK does not work

I have tried just connecting the lock switch wire to 87A and motor side lock wire to 30 (this should be closed by default) and it still does not work. The switch is fine (tested). I have tried 3 different relays.

Stumped and have worked with another installer who is also stumped.

Have also tried the following configuration as recommended in a previous post:
unlock relay:

86 output from alarm (unlock)
87a switch side
30 motor side
87 12 volts
85 12 volts

lock relay:

86 12 volts
87a switch side
30 motor side
87 12 volts
85 output from alarm (lock)

Thanks!

Replies:

Posted By: Craig3708
Date Posted: January 02, 2005 at 9:07 PM

Lock and unlock are wired different on this truck. Wire the lock side as follows

Pin 85 to lock from r/s

Pin 86 & 87 +12volt

Pin 30 to lock wire in truck (rejoin your lock wire, and tap into it)

Craig

Posted By: mrwhitehat
Date Posted: January 02, 2005 at 9:19 PM

Thanks craig, worked great, wish this had been in the many, many pages I downloaded, purchased, and the many posts from other members - you rock and are our hero! three cheers for Craig!