1990 Honda Accord SPEEDOMETER,TAIL LIGHTS, AND RADIO SHORTI

Electrical problem
1990 Honda Accord 4 cyl Front Wheel Drive Automatic 200+ miles
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MY SPEEDOMETER AND RADIO KEEP SHORTING OUT. TAIL LIGHTS DON'T WORK. INSIDE OF DASH DOESN'T LIGHT UP ANY MORE WHEN THE HEAD LIGHTS ARE ON. ALREADY CHECKED FUSES AND BATTERY AND ALTERNATOR ARE KESS THAT A YEAR OLD.