So all of a sudden my rear brake lights and the rear turn signals stopped working. My turn signals still light up on the dash and are blinking fast as if a bulb were out.

So I replaced the bulbs, still not working.
Power is going back to the bulbs I checked.
Then I replaced the multi functions switch. Still Not working.
No fuses are broken

Not sure what else It could be. The reverse lights come on, and so do the parking brake lights.

Any advice would be greatly appreciated, I really need the truck working since its my DD and im on a military base, cops everywhere.

 

Check the grounds for the rear lights.

 

Do you happen to know where they are grounded to?

 

Unfortunately, no. I don't.... Wiring diagrams available anywhere?

 

Well actually could it be the brake light switch ? If this was bad I didnt think that the turn signals would not work as well?

Reason for me suspecting this is because my third brake light does not illuminate. I am sure that the third brake light is run off a different circut then the blinkers and rear brake lights. So if that is not working as well, it could point to the switch?

 

I think both use the same filament, and the same ground. Might try and see if you can follow the ground wire, and see where it goes......

 

Yeah I will try , I just tested the wire from the brake switch to the tipm, gets power from switch to tipm when pressed so the switch is working. Now going to see if it sends its along to the rear, if it doesnt, then I think the tipm might be the problem.

Thing is the ground wire with the rear lights goes all the way to the front somewhere in the dam bundle of wires, its going to be a pita to find where it goes, im surprised its not grounded in the back somewhere.

 

This is where a service manual comes in real handy, it tells you where all the ground locations are...... It will be one of THE BEST investments you can make in your truck.

 

So this is what I did

when you step on the brake the switch sends the voltage directly to the 3rd brake light, and also is sent back to the TIPM's brake switch input. The TIPM then turns on a high side driver (transistor) and sends battery voltage out to the rear brake lamp assemblies. Here is what I recommend for you to do: remove the tail lamp housings from the bed of the truck (2 torx screws and PULL) then disconnect the lamp connector. Get a 12 volt test light and see if there is power on the white wire with a yellow tracer (right lamp) and also check the white wire with a light green tracer (left lamp) while someone steps on the brakes. Then do this again but this time with the turn signals or flashers on.

I did this , and there was no power on the wires when stepping on the brake or apply the turn signals.

"Ok that tells us that the brake light switch is working. The third brake light gets it's power directly from the switch but the outer lights get their power directly from the TIPM "

Got that quote from a dodge cert tech.

However my third brake light does not light up when the brake is brake pedal is activated, but the power is going to the tipm, just not going from the tipm to the rear.

 

I think the ground is in the engine compartment.