Re: bulb is goog but the left brake light and signal
Does it have trailer light plug. After market trailer plugs cause all kinds of problems and should be removed and replaced when they do. Also check the bulb in another socket to make absolutely sure it is bad. I have been fooled more than once by newer bulbs that break connection towards the bottom and you can't see it
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If these lights still work on your excursion then it is probably not a fuse problem. It sounds like it is a loose pin(s) with the trailer plug or a loose electrical connection(s) on the trailer or maybe the bulbs on the trailer are burned out. This should help, if not then contact me again at FixYa and I will be glad to help.
Hello. The symptoms you are describing are likely due to a poor ground. Temporarily install a new ground wire by securing a piece of copper wire to the frame with a self tapping screw. Use this ground wire along with the hot wire to see if each of these lights works. If it does, trace the ground wire back to the frame, unscrew it and clean up the metal with emery cloth so you reestablish a good ground.
You may have some wiring 'grounding' problems in the areas of concern. Remove each connection, and clean any rust. Place a light film of grease and a fresh star washer next to ground point, then the wire connector and other washers. Tighten firmly. Check the lamp sockets for any corrosion and replace same if found. The front lamp flashes rapidly because the rear light not working causes the flasher unit to switch faster.
Rear lights are double filament bulbs one side for the lights other side for the brake/turn signals so it still may be a bulb. Do u have a test light or volt meter you can check to make sure u have power there when brakes or turn signals are activated. Or just try another bulb.