Disconnect the brake lines and wiring harness from it and put the new one in. YOU will need to bleed the brakes after your done. Make sure to disconect the battery of the truck before you unplug the wiring harness
check wiring from battery to wiring harness to fuse (check fuse also) to harness to brake light. Check ground, too
It plugs into the taillight.
Its located on the brake pedal. Unplug the wiring harness and unbolt it and replace it.
on the drivers side under the door, mounted on the frame, near the fuel filter, it looks like a solenoid with a few brake lines connected to it, and a wiring harness
on a 1995 ford, there is no brake control harness.these are added by who ever installs brake control
The brake controller wiring harness connector for the 2005 GMC Envoy is located under the dash on the driver's side of the vehicle. Look for a connector plug not connected to anything, next to the hood release latch.
They run cables and brake lines on the tunnle not wiring so in short NO
You need to purchase the add on harness from the dealer. This harness plugs into one of the junction blocks located under the driver's side of dash above your left foot area. The other end of the harness attaches to your trailer brake controler. The trailer brake "blue" wire in back is folded back and tucked in the rear harness on the left side of the rear frame rail. You may have to drop the spare tire to expose it and connect it to the trailer connector plug.
i cannot get the brake lights to work
You really don't need it. You just need to identify which harness goes from the ECM to the jake brake.
Try the brake switch under the dashboard up at the top of the brake pedal Or you might check the fuse or even possibly the wiring harness connection at the back of the vehicle. A lot of cars have a connector that connects the rear light wiring harness with the main harness. These connections are prone to corrosion. When they get too corroded the wires can break causing the lights not to work. The brake switch on the brake pedal is the least likely cause of this problem unless you have been working up under the dash.