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So you're saying with your headlights off when you hit the brake pedal your brake lights don't work but when your headlight are on they do work? If that's the case sounds like your rear running lights and brake lights have tied themselves together on the same circuit
In the Uk nearlly all trailor socket wiring is done from the rear light wiring of the towing vehicle so I suggest checking the wiring back from the trailor connection socket and also socket, it could be a broken or cut wire. Also will probably find your vehicle a control unit fitted the trailor socket which could also the problem. Find the pin outs for your turn signal on the socket and connect a bulb across this connection and the common earth to check its not a fault on your tralior.
more than likely a fuse or a relay is bad. locate the fuse for the headlights (owners manual) and check if it is bad, if the fuse is good, find the relay and give it a flick or two and try the headlights then, if they work, its time for a new relay
Your cruise will not work if the brake lights are on just like the cruise disengages when you hit the brakes.As far as the brake lights with the headlights,sounds like there is something crossed.If you hold your breaklights on with your headlights off is there a glow of the headlights or your running lights.If your rear bulbs are the round push in and turn type make sure they are installes correctly.You may have one where the contact on the bottom of the bulb is causing a jump of power from your running/parking light over to the brake light side.Well hope this helps 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
Wow, that's a strange one!
Try removing the brake light bulbs, and then see if the headlights still come on with the brake pedal. If the headlights still come on, there is a short to voltage somewhere in your wiring ( in other words, somehow the brake light circuit is feeding the headlights ). If the headlights stop coming on with stop light bulbs removed, you have a bad ground in the stop light circuit. Clean the contacts inside the light bulb sockets if there is any dirt or corrosion. Hope this helps.
there's a box on the drivers side at the back in the luggage area that is accesed by removing the plastic side panel that will do what you are saying. it is caused many times by a mis-wired trailor.
This sounds like some wires may not be connected or connected improperly.On this vehicle the wire colors are: Brown=parking lights,green=right turn/brake,yellow=left turn/brake. You will have to drop the spare tire to get a good look at these.
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