I have traced the wiring from the main harness wiring plug to the brake light module plug and got continuity in the wires. 12 V is at the harness plug but cannot get it back to the Rt. light module brake light socket as far as I have checked everything is grounded OK. It appears the socket maybe bad or reversed some how. Still, checking module for correct polarity, etc. Do you know of anything else to look for or check.
Re: Left brake light works but the right does not.
Reversing the plug connnection is far fetched for the plug would have a guide that will fit into the other socket. If this is not in proper position it wont go in. What type of bulb housing do you have? is it the plastic base type? If it is check and see that the ground connection is not insulated at the terminal. There is a certain plastic coating that develops upon prolonged usage of the lamp assembly itself and is normal, only have to clean out the coated terminal to have a bare metal contact. Did you check the bulb socket of the right brake lamp itself? Heat can cause the terminals plastic surface in the socket to be deformed . Check on this also.
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Low voltage would mean that there is corrosion further up the circuit. Corrosion equals resistance. Resistance equals voltage drop. Keep searching the wiring and connection further up. You're bound to find some green fuzzy corrosion at some point
With a test light check if you have power there with lights on and with lights off, compare left side with right side as far as location in the tail lamp plug for the tail lamp park lights.Trace the harness back to the left side underneath usual corrosion in this area.
Make sure your dash lights are working. If not then the headlight switch needs to be replaced. If this is okay go to the back of the truck under the rear bumper on the driver's side and you should see a plug where the tail light harness plugs into the body wire harness. Check this carefully for corrosion ( green gunk) and broken wires. Over time this plug usually corrodes up and wires rot off. I always cut it out and spliced the wires together with heat shrink tubing and tape.
The light sockets ground to the box behind the lens so make sure the black wire has bare shiny metal to metal contact on both sides of the box. The sockets themselves could also be worn enough so as to not make proper contact. Also check the wire harness at the light for chaffing and bad insulation. If I had a nickel for every time I had to fix this....... I kept a roll of tape in the truck at all times.
If you still have nothing, then you will likely have to follow the body harness back to the fuse block looking for the same thing, chaffing or broken wires. You can remove it by undoing the 5/16 bolt in the center of the block and pulling off the left side. All wires to the back of the truck are on this plug.
If you still have nothing then check under the dash. Trace the wires from the brake light switch to the wires from the blinkers. They both use the same side of the bulb. Dark green and yellow if I remember right.
If you have the floor mounted dimmer switch, check the plug in for it very carefully for corrosion. I'm pretty sure your wires go through it too, not sure why. Hope this helps.
either bypass a new wire or trace back for break /connection, if it is anything like a dodge truck wiring it was much easier to run new wire to left turn, I don't know what the hell these engineers think, But im sure there is a reason and it is definately not for the cunsumer.
No you cannot just connect the 3rd brake light to the left/right brake light, chances are they also function independently as turn signals. The type of trailer wiring harness you speak of is usually installed by unplugging the wiring harness and plugging that connector inline. The two sides of that harness should plug back together.
Sounds like a turn signal switch. Earlier models would use the same bulb for the brake and turn signal. The turn signal switch will interrupt power to the brake light and route the signal to either the left or right bulb depending on with way you where turning. Usually you can wiggle the turn signal switch and get the brake light to work momentarily when this is the problem.
Newer vehicles use a lighting module that looks for inputs from the turn signal switch and brake pedal switch and then decides where to send power. This module is also know to go bad.
poor ground, check the wire harness, this is the one that comes from front of vehicle to the rear and plugs into the wires that go to the rear lights. trace the wire coming out of the light itself and eventually you will see that it comes to a connector that attaches to the wiring harness.
There will be a connector where the tow package wiring hooks up into the main wiring harness. Trace the wires from the trailer plug back till you find the connection place. Wiggle or carefully remove outer protection. You will find the bad connection if you are patient. It is to nice of a rig for duct tape and toggle switches.
I had a problem with my trailer light wiring, everything was working except one light, I used an OHM meter and traced from the socket back to the next joint and found I had a broken wire, I split the factory harness and repaired the wire, you may have the same problem, mine was under the truck left side above the frame
If you have a trailer plug installed trace the wires to see if there is a bare spot or broken wire.If no plug then you need to check for bare wire or broken wire from tail lamp assemblys to where the wire plugs into main wireing harness.