Posted by used red mn on January 10, 2021 at 21:16:09 from (75.73.112.20):
In Reply to: Re: Trailer Wiring posted by rustred on January 10, 2021 at 19:18:20:
Hope I am not to late, if you wired by the color of the wires rustred gave it is correct and those are the colors you will find in most GM wiring at least prior to 1990. Sorry, bc but the explanation you gave is NEARLY correct. The brighter element in the 1157 dual element bulb is the the stop and turn, which are green right and yellow left. The power from the stop light switch when activate goes up through the switch in the steering column and when no turn signal is selected back out to the bright filament of the tail light. When a turn is selected contacts in the column direcect the wire to the bright tail light filament to be powered by the flasher circuit thus interrupting the steady on bright filament ..brake.. on the selected turn side to flash. The dimmer filament is simply the tail light or running light circuit which is the brown wire. Sometimes you would see were the bright filament was wired as the constant on tail light and in some later models that used plastic housings and sockets could melt from the higher heat produced. I could go on to explain how front vehicle turn signals with side fender lights were wired to be both a turn and side marker with a single element bulb, but that would be much easier if you were here with me so I could draw a circuit diagram. Oh I should add if you are towing with a newer model or foreign vehicle they may have a 4 circuit tail light system. This means there is a circuit for right turn, left turn, brake and tail. Meaning each side tail light needs 3 elements, a change added mostly due to the addition of the third center brake light. You will need a converter that electronically converts that vehicle wiring to match the older wiring of your trailer.
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