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My daughters 1975 f100 automatic truck developed a problem recently. No work has been done to the truck, it just happened.
No back up lights.
Also, the pass side rear tail light will go out when the brakes are applied. All other lights seem to function fine.
I did move the nss through its cycle a bit and no reverse lights.
I know i need to check grounds, but already did two of them.
are they related? and any suggestions?