Need a wiring diagram to fix the rear lights on 87 dodge diplomat

If both the brake lights and rear turn signals are not functioning in your 2008 Dodge Charger, there are several possible causes to consider. Here are some common issues that could lead to this problem:
1. Blown fuses: Check the fuse box for any blown fuses related to the brake lights and turn signals. A blown fuse can interrupt the circuit and prevent the lights from working. Refer to your vehicle's manual to locate the specific fuse for these functions and replace it if necessary.
2. Faulty bulbs: Inspect the bulbs in the brake lights and turn signals to see if they are burnt out or damaged. If a bulb is not working, it should be replaced. It's possible that multiple bulbs have failed simultaneously, leading to both the brake lights and turn signals not functioning.
3. Wiring issues: Check the wiring connections and harnesses for any signs of damage, loose connections, or corrosion. Faulty wiring can disrupt the electrical flow and prevent the lights from operating. Repair or replace any damaged wiring as needed.
4. Malfunctioning brake light switch: The brake light switch, located near the brake pedal, activates the brake lights when the pedal is pressed. If the switch is faulty or misaligned, it can cause the brake lights to not work. Consider having the brake light switch inspected and replaced if necessary.
5. Faulty turn signal relay: The turn signal relay controls the flashing of the turn signals. If the relay is defective, it can prevent the rear turn signals from operating. Consider replacing the turn signal relay if other potential causes have been ruled out.
If troubleshooting these common issues does not resolve the problem, it is recommended to consult a professional mechanic or authorized Dodge service center for a more accurate diagnosis and repair. They will have the expertise and necessary tools to pinpoint and fix the specific issue with your 2008 Dodge Charger's brake lights and rear turn signals.

The lower brake lites are wired through the multifunction switch. The high-mount stop lamp is wired differently. Stop and turn at the rear use the same bulb filament, just not at the same time. See the D and E at top, that is voltage for either stop or turn. The black wire from bottom of lamp should be ground.

you need to inspect wire harness @ rear and along frame rail , corrosion , damaged wire, bad connection, check for continuity, power, ground wires are extremely important . brake light switch could be at fault !!!!!!!!, power to both brakes & turnsignals must be determined , both of these circuits cross each other, see wire diagram

Just had a similar question last week, and the solution was a bad socket/bulb holder.
You might try and see if there is current in the brake light wire leading to the bulb holder.
I have used a jumper wire and a safety pin to test the wire behind the socket.
I pierced the plastic insulation of the brake light wire with the point of the safety pin, and either use a tester or even a good working bulb and a good ground wire.
Be blessed.

The rear brake lamp is a whole module. Get the whole unit for left and right no after market one the pins are not always correct

Wiring diagram for rear section

The bulbs could still be the problem since they are double filament bulbs.If your high brake light work but not the low ones the replace the bulbs.If none in the rear work then you may need a brake light switch(on the brake pedal linkage).If this is not the case the check for power to the brake light side of the bulb and repair the broken brake light wire.

you need to do basics first,
check to see if bulbs are good,then verify no voltage at bulbs,
check to see if your truck has has a tailor hitch and wiring installed.
where they connect to your original wire is where you need to check first,

Check all the fuses.

Go to http://www.hmaservice.com/ and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.