colorado tail light wiring..

shaved the rearof a colorado, installed new lights with a converter, when pressing brakes, it is feeding votage back through turn signals.
 
got a new converter, double checked wiring, same problem..
 
any one have this problem?
 
running lights, brake lights, turn signals all work, but brake lghts is feeding power back through the trun signal wires...
 
going to try diodes to stop power from runnin back through the circuit, but this really shouldnt be happening in the first place...
 
any ideas?

Good luck Jamie.  Those lights sure are a PITA. 

i think i need to change the flasher.  ill try that today at lunch.  after thinking about it all night, the colorado has more then one bulb in the circuit,and that creates a bigger current draw through then the one bulb i am using now (or LED's in the future)  i didnt think about it then, but anytime you swap in LED's you always change the flasher, or wire in a resistor to simulate the extra load of a filament bulb. ill write more when i swap the flasher relay..

found out colorados dont have relays for the turn signals.. the BCM controls the turn signals.. i know im not the only one with shaved tails.. any one else had this problem

:BUMP:

same problem here, havent gotten around to ordering some resistors, its pretty annoying cause if my cruise is set and i use my turn signal it shuts the cruise off...

found this "cicuit" on another web forum (  http://www.coloradofans.com/forums/viewtopic.php?f=1&p=815675  )  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 rightFrom 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 colorYellow 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 signalOther 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 codeWhite: Ground Brown: Running Yellow: LT and Stop Green: RT and StopNOTE! those of you that have LED lights on your trailer may have to put a 50ohm 10 watt resistor across the left tail output and another across the right output to make a load for the circuit to operate properly (radio shack p/n 271-133)

so i made the above circuit, installed it, and my left turn signal works perfectly.  the right turn signal will flash faster when brakes are applied, as if there was a bulb burned out.  but only flashes faster when the brakes are applied. i have not installed a resister inline yet, but that shouldnt matter, as i dont have LED lights, so the resistance should be making any difference. (ill be trying anyways to get a definite answer) but so far im this circuit works, just needs some more fine tuning.