What what wire do I tap into for my parking and turn signal...hooking up lighting harness for plow and dont have wire colors...

Sidelight, break light, turn signal. You can use a test meter to identify.

What is the color code for trailer wiring? On a 4-Way flat trailer wiring harness, white is the ground, brown is running lights, yellow is left turn signal and green is right turn signal.

Standard Color Code for Wiring Simple 4 Wire Trailer Lighting ...

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The wire colors should be Yellow, Black, White and Green. Do not cut or splice anything into this harness. Use the trailer lights Tap connector that is already in the harness. It is located in the left frame rail near the rear bumper. The converter is a plug and play operation. No splicing is needed. Simply unplug the harness at the Tap connector and plug the converter T plug in series with the existing harness.

google search year make model wire schematic

When this happened on my '01 venture, it disabled the traction control. What happens is that the left(in my case) taillight wire harness corrodes from rain and melts the contacts to the lights. If I step on the brakes when the turn signal is on, both dash turn indicatoprs will flash and the outside signal flashes quickly. The fix was to purchase another harness and splice it in, in place of the damaged one. It has happened twice to me within 4 months so I replaced the splices with quick connectors in case it happens again. I went to the junkyard and purchased 3 extra harnesses for little money and keep them in the car. Otherwise we love the van. HTH and good luck.

I suspect that the 4 wire harness includes a ground, so you may not be able to connect both brake lights and turn signals, which are separate lamps on the pickup. You may need to get an adapter.

In any case, the color codes on the pickup are:

Tail lights -- pink/blue
Brake Lights -- green/yellow
Left turn signal -- gray/blue
Right turn signal -- gray/red
Ground -- black

Oh boy, Chevy uses 3 important wires to make up their tail light harness. Brown is used for your parking lights and yellow and green are your signal and brake light wires, yellow one side, green the other. You have some seriously crossed wires. Start with tracing the lic plate lite since that works. Make sure it leads into your main parking lights and the ground wires from these tail lites aren't cut. The lic place lite will work with just power because the body of the lite is grounded with the bumper. Then make sure that there is power to the signal wires. You can do this with a test light and the signal light switched on. You don't need anyone to step on the brakes since it's the same signal, only interepted. Most importantly, Remove the tail lites and check grounds!! Good luck

for your trailer you need park light, brake light, left and right signal light. the best way is to tap them in the rear tail light wires.

You will need a test light, don't worry about the colors. Four wires, one for left turn signal, one for right turn signal, one for parking lights, and one is ground(usually black). Hook up ground, turn on trucks left signal and hookup to one of trailers other three wires, you will either light up the correct light or wrong one just continue til lights match coming off your truck to what you want to light up. And brake lights are left and right signal, so if you do signals the brake light will work. I can explain further if you need help.

I'm assuming you're just going to splice into the tail light wiring so that's what these wire colors are:
at the tail lamp 3 way connector:
black and yellow = park lamp
dark green and brown = left turn signal
there should be another connector with violet and black wire for reverse lights.
the stop lights are turned on through the turn signal circuits.

You have a bad ground. Take the battery out and see if there is a ground wire in that area that has been damaged by corrosion.