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There is a tail lights fuse for the truck, but not for the trailer.
First, check that your left tail light on the truck is working, if not fix the problem (new bulb, bad contact, fuse).
Then the obvious suggestions regarding the trailer are: Check the tail light portion of the bulb to be sure it is not blown. If good (best to put in new one to be sure), then check the wiring from the front of the trailer all of the way to the non working bulb, including every connection and at any place it is secured to the trailer frame. If all is good with the trailer circuit and bulb, then check the truck's trailer connector, including any adapters. If by chance the truck is wired with a flat 4 wire harness the problem may be solved (but usually the blinkers are the problem). Modern trucks require a 5 wire harness which self adapts to the standard 4 wire trailer circuit. Check for dc power (12 volts) from the truck's female connector. One wire will be ground, others will be taillights (turn on headlights), brake lights (have someone press brake pedal), and blinkers (turn on switch and blinkers).
The signal wire going to the right front has a splice for the dash indicator, a wire branching off from the turn wire and going to the dash. It sounds like that right signal wire is broken or lost a connection before it splices off to the dash, so the problem sounds like it is under the dash, either coming out of the turn signal switch to the flasher or from the flasher to that splice. You may need a multi-meter to check voltages on that wire at various places under the dash. Ascertain which color wire you need to concentrate on. Check for voltage on it with key on and right blinker on-voltmeter will spike to battery voltage, then fall to zero as the flasher breaks voltage continuously, if checked after the flasher. If checked when leaving the turn switch, it should be a continuous signal on that wire. Think you better find a wiring diagram to find the right wire to check. Good luck.
With the left blinker on check for power on the black wire. If there is power than the ground is bad on that wire. You will need to trace it to its grounding point making sure there is no corrosion in the wire, the wire is not broken, and the ground is clean.
If that checks out you may have a bad socket. I think the sockets on these plug into the harness. You can try swapping the socket to the other side and see if the problem follows.
If the brake light on that side doesn't work then it's the socket. If you use 3157 bulbs then try prying the tabs in the socket first, if that doesn't work, replace the socket. if the brake light does work then you have a short/ broken wire. you will have to trace it back to the short
Usually a fast flashing signal is because one of the bulbs is burned out or shorted out. If the signal and brakes use the same light which many cars do then check the wiring to it and replace bulb. If burns out again then it has a short between the signal switch and the actual light or the brake wiring to it is shorted.
That's an issue with wiring somewhere alont the line. There has to be a short somewhere. Hopefully for you the short is from the new taillight assembly being installed and it would be relatively easy to get to. Hope it helps!
bad ground ..trace from bulb area back to fuse block with flashers...wire is shorting to ground or ground is loose.. good luck... also... my 05 ram had wrong sized gaskets around bulbs in back causing bulbs to not last til i discovered it not sealing out the elements and replaced