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I'm not a eletrical guru but if all lights are flashing then there is a common wire to them all
Did you happen to read the post directly above yours? The common wire is the one in the bulb that both filaments are attached to.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
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