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1983 911SC Radio and Speedometer Power Loss on Bumps

Electrical

Vehicle Information: Model: 911 SC; Year: 1983; Body Type: Coupe; Total Mileage: 127700;

I keep losing power to my radio when I hit road bumps. Recently, I lostmy speedometer/odometer with the radio. They come and go together as aunit now. I asked a speedometer tech and he said it's likely a dirtycontact that holds the fuse. I inspected my fuses and cannot determinewhich fusegoes with the speedometer. I twisted all fuses in their holders in thehopes that any dirty contact point would clean up. I also noticed thatthere are some fuses in-line with wires under the dash. Could there be aloose contact there? Am I on the right track?

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