Tailgate lock

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=38910
Printed Date: September 15, 2025 at 1:47 AM

Topic: Tailgate lock

Posted By: DaveK
Subject: Tailgate lock
Date Posted: September 10, 2004 at 10:39 AM

I am planning on installing a power tailgate lock on my 2003 F-150 and connecting it to the Viper 881xp. Can I add a switch to permit me to unlock the tailgate from the cab and still keep the doors locked?

Thanks.

Replies:

Posted By: TonyPTX
Date Posted: September 10, 2004 at 11:19 AM

I did something similar to this w/ my '03 F150. Check out the post over at f150online.com

https://www.f150online.com/forums/showthread.php?s=&threadid=156343&highlight=tailgate

As for adding a switch, I'm guessing you want a single momentary push button to open?

Posted By: DaveK
Date Posted: September 10, 2004 at 11:43 AM

Thanks for the info. A momentary push button is exactly what I was thinking of. Now, the question is, how to wire it up?

Posted By: TonyPTX
Date Posted: September 10, 2004 at 12:20 PM

Lock and unlock, or just unlock?

Posted By: DaveK
Date Posted: October 01, 2004 at 1:27 PM

Both.

Posted By: TonyPTX
Date Posted: October 01, 2004 at 3:35 PM

Last question...

Do you want the push button to be independent of all the other lock/unlock switches? I'm thinking you want just that...a button on the dash, push once to lock, push it again to unlock...

Right?

Posted By: DaveK
Date Posted: October 18, 2004 at 2:58 PM

Actually, I was thinking about trying to use a separate switch to lock/unlock in conjunction with the regular door lock/unlock button.

Posted By: floaterr
Date Posted: October 19, 2004 at 1:16 AM

Ok, if you have OEM keyless entry then you'll be sending negative to the lock/unlock wires from the alarm. To install the taillock you'll have to use this setup just to move the unit. You probably know this already. Then doing this should work.. Anybody agree?

Posted By: floaterr
Date Posted: October 19, 2004 at 1:33 AM

IF however you don't have OEM keyless entry then you'll be using the 5-wire reverse to l/u everything (tail included). To add the momentary switch you'd have to use another 5-wire setup where the pink & green wires would now be the wires going to the tail motor AFTER the previous relay.
@@NOTE: the lower relays would NOT be connected to the alm leads like the COPIED diagram states. Those should just be connected to the momentary switch.

Obviously these relays could all be bundled together using the same positive since they should never be flipped at the same time.

Posted By: floaterr
Date Posted: October 19, 2004 at 1:46 AM

Oooops.. After looking at that I realized the normal hookup of the tailmotor is just to tap off the L/U motor wires in/near the door.
The OEM keyless entry DIAGRAM changes now to

posted_image

The 5-wire setup stays the same (since it just builds off this one).

Sorry for the confusion.