door lock relays

You will need to wire up two relays like this :

• 86 & 87 : Constant 12 volts
• 85 : ( - ) Alarm door lock or unlock  wire ( or your trunk trigger wire form alarm )
• 30 : ( + ) output to door lock/ unlock ( or your trunk release wire )

Yeah, what Jeff said.  One relay for each function.  So you'll need three relays.  The ones from DEI clip together, or you can lay three separate ones side-by-side and tape them together---it's easier and neater to intall them as one relay bank.

I'm surpised that your alarm doesn't have outputs that do both negative and positive; it's a common feature these days.

You bet !! All right on all three of the above. You need (3) relays to do each individual wire.

Are you using a SPDT relay rated at 30/40 amps ? Where are you grabbing the constant power from for the relays and also is the target wires the proper wires that you verified with a DMM ?

A SPDT relay at 30/40 amps?

             not sure. I bought the relays at radio shack for 6 bucks each. it has four outputs (85,86,87,30)

Where am i grabbing power?

coming from the '87' of both relays, i have them tied directly to a 12 volt source near the battery. I know it is good and hot because it is the same source i use for my audio system (amp power source). Also i assume the red wire coming from the alarm is a 12v source. In my instructions that came with my alarm, it says to tie this red wire into '86' on both of the relays.

Are the wires the proper wires i verified with a DMM?

I don't know what a DMM is. However, i do believe they are the right wires. It seems they are tied into some kind of factory relay.  In another post awile back, i told you it had 6 wires: light blue, grey, thick black, ORANGE / black, tan, and thin black. You then told me: "This black box is your door lock relay module for the GMC. The wires you are looking for are in this module. I posted the wire colors of this truck in a previous post and because you have factory keyless entry, your GMC requires a (+) pulse activation and this will locl/unlock the doors. The wires are all there and if you test the wires for circuit verification, you will find which wires you will need.".........So i did test them. This is what i found. The light blue and the grey show +12v when the lock button is pushed. The thick black shows nothing (assuming ground). The ORANGE / black is constant +12v. And the tan and the thin black wires show +12v when unlock is pushed. These are the right wires right? Does it matter which lock or unlock wire i tie into? I am tied into the lt blue and the tan right now, and nothing works. What should i try?

Dyer

There's your problem, you need the relays that have 5 contact points like this:

        l

   l   _    l

        l

ok i'll try that. would my other relays by chance drain my battery?