First thing, if its aftermarket (sounds like it is), when the key is on check for 12v+ on the Yellow & Red wires. Also check for continuity to ground on the Black- wire. If these 3 are good and it won't power up -- its toast.
First thing, if its aftermarket (sounds like it is), when the key is on check for 12v+ on the Yellow & Red wires. Also check for continuity to ground on the Black- wire. If these 3 are good and it won't power up -- its toast.
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