I have a 79 surburban and the rear right turn signal doesn't flash.I
checked the bulb and put it in the left rear side and it worked. When
i put on the flasher only the right rear doesn't flash. If the
filiment which controls the running lights work why doesn't the turn
signal which is the other filement in the same bulb work?
Its the same bulb, but two completely different circuits. The two filaments
in the bulb are seperate from each other. The short filament is the turn
signal. If it works in the left side, (bulb is good), then you may have a
bad ground on the right side.
Turn on the 4 ways and see if it lights, Or step on the brake. If not
the bulb is bad. If by working in the left side the bulb flashed like it
should then you have a bad socket or a bad ground on the right side.
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