Re: 1965 Mustang signal lights
Just a thought but just a few years ago, CHI-COM 1157 BULBS SLOPPY COPIES were coming in. The two contact on the bottom of the bulbs would not make full contact with the lamp socket. Swap bulbs around.
It has been been mentioned previously, but a bad turn signal switch can give the same results. Have you tried checking socket continuity with a test light?
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