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First you need to find the Stop, LH/RH turn signal and Taillights for the car. You will need to get to these light bulb sockets. Have someone operate each of the cars lighting functions whilst you find the socket and the wires going to it. One wire will be the ground wire. You will need to only find one wire for the brake and taillights. If you don’t have time and you are driving only during the day skip the taillights for now.
You can determine the opposite turn signal wire as the brake and running lights on both sides use the same color wire. Find the wire that is a different color going to the other side of lights.
Determine the type of lighting system the trailer has? Separate tail, stop and turn signals or just one brake/turn light and a taillight.
If only a two light system you will need a converter. The converter should have the installation instructions. If you don’t have a converter and only drive during the day, skip the taillights and just hook up the wires for the brakes and turn signal lights.
If unsure about the trailer wiring, you can again start at the bulbs to find the wire colors or power the lights with a battery. If the trailer has separate tail, stop and turn lights, just hook them up directly (through the wiring harness and plug) to the cars wires.
If the trailer is running too many bulbs per circuit as in four tail light bulbs, this may put a strain on the signal flasher unit. On this size boat trailer I assume the lighting is minimal.
Remember the trailer ground wire needs to be connected to the cars ground wire which is usually black. Sometimes the trailer bulbs are grounded through the trailers frame.
The 31827 does not appear to be a converter, just a wiring kit.
The wire for a Camry is below, not sure if this is the same as your model:
Turn L/H Green/Black
Turn R/H Green/Yellow
Stop Green/Red
Tail Green
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