You need an adapter to make them work properly...
Check this it out it will help alot...
http://www.coloradofans.com/forums/viewtopic.php?f=1&p=815675
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
Here is a circuit you can build in about 45 minutes, and it costs 6-8 dollars in parts besides the universal 4 pin trailer harness.
Truck connections on left side, 4 pin trailer harness on right
From LEFT BRAKE LIGHT____(+D1-)___(+D2-)___(+D3-)___
From LEFT TURN LIGHT______________(+D4-)___________]__YELLOW____
From RUNNING LIGHTS__________________________________BROWN____
From CHASSIS GROUND_________________________________WHITE_____
From RIGHT BRAKE LIGHT___(+D5-)___(+D6-)___(+D7-)___
From RIGHT TURN LIGHT_____________(+D8-)___________]__GREEN_____
D1-D8=6amp 50volt silicon diodes radio shack p/n 276-1661 (you'll need 2 packages each pkg.=$2.49)
Instructions:
1. Cut and solder D1, D2, D3 together end to end, Cathode to Anode.
(Cathode is Negative and is the end with the silver band.) I recommend a hook splice solder joint, not offset splices.
2. Solder D4 cathode to D3 cathode, and then solder those to the YELLOW wire of the 4 pin harness.
3.Repeat steps 1 and 2 for the D5, D6, D7 bank, and then D8 cathode to D7 cathode.
4. Solder the GREEN wire of the 4 pin harness to the D7, D8 Connection.
5. Solder wire tails to each input to splice into your Vehicle. One on each: D1, D4, D5, D8. These go to the turn signals and brake lights on each taillight.
6. Tape over all connections, then tape the left wires and the right wires to bundle them.
7. You'll splice the wires as follows:
Truck wire harness color
Yellow wire = left turn signal (D4)
Brown wire = Left brake light (D1, D2, D3)
(NOTE! You will need to trace out the correct wire as brown colored wire is used for both running and brake lights in the truck's wiring harness!
Yes, you can tie both left and right brake light wires from the trailer harness together, and connect them to one side or the other, but I like
symmetry and I recommend tying them in on each side.)
Green wire = Right turn signal
Other Brown Wire (License plate lights) = Running lights on trailer harness (brown)
After these connections are made, connect the trailer harness white wire to a good ground (a screw through the rear support flange on the
frame for the bed is the best.)
Connect your trailer to the connector to verify operation of the circuit, or use a test light to make sure the lights come on with the brakes,
and the test light flashes brighter when the turn signals are on.
4 pin harness color code
White: Ground
Brown: Running
Yellow: LT and Stop
Green: RT and Stop
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I have a spliter on my 2004 chevy colorado for my trailer lights when i turn my right signal all the light come on the trailer when i turn my left signal nothing happens and i have no stoping light ,were can i find the right adapter
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