Electrical problem
1996 Ford Thunderbird V8 Two Wheel Drive Automatic 130000 miles
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After heater core replacement all seemed fine until I pressed the over-drive button. This blew the 5 amp fuse labeled RUN. Replaced fuse, with same results upon hitting same switch. Have 12 volts to switch which checks good per ohm-meter. Biegh wire with white stripe checks good from switch to what appears to be a relay located under the right side of instrument panel. I have no schematic so I need suggestions.