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1987 GMC S15 radio shuts off when head lights or blinker are used

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ok so my aftermarket pinoneer super sound 3d works great... until I use the headlights or blinker. then it seems as if all the power is automatically converted to them and away from the radio, gauges and all the lights in my truck. I am not sure why. it was working properly when first installed then started doing this which leads me to believe it is not a wrong wire hookup. Also every once in a while if I hit a big pump it all comes back on. Could it be a fuse?


Any ideas are appreciated. I have redone the wiring of the radio and it all seems correct.

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