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I HAD A 1998 BRONCO II THAT HAD THE SAME PROBLEM EVEN THOUGH I HAD INSTALLED A NEW 1000 AMP DELCO BATTERY. I DISCONNECTED THE NEGATIVE BATTERY CABLE. WITH EVERYTHING OFF INCLUDING THE +12 VOLT LEADS TO MY RADIO DISCONNECTED, A VOLTMETER HOOKED BETWEEN THE NEGATIVE CABLE AND NEGATIVE BATTERY READ 12 VOLTS. THE DIODES IN THE ALERNATOR WERE SHORTED OUT. I WENT TO AUTOZONE AND HAD THEM CHECK THE ALTERNATOR. IT CHECKED BAD. I BOUGHT A NEW LIFETIME WARRANTY ALTERNATOR. WITHIN ONE YEAR THE NEW ALTERNATOR DID THE SAME THING. I HAD SOLDERED IN THE NEW WIRING HARNESS WITH PLUG, SO WIRING WAS NOT THE PROBLEM. IT TURNS OUT THAT THE NEW ALTERNATOR HAD A SHORT LIFE. AFTER THAT THE BRONCO II GOT BETTER GAS MILEAGE, AND STARTED INSTANTLY. ALSO WITH THE NEW SECOND ALTERNATOR INSTALLED THERE WAS ZERO VOLTS BETWEEN BATTERY NEGATIVE AND NEGATIVE CABLE. I AM 100% SURE THIS WILL FIX YOUR PROBLEM. P.S. DO NOT FORGET TO USE GOOD HEAT SHRINK TUBING AND ROSIN CORE SOLDER.

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Q: 1995 Ford Contour V6 Durotec test light on negative battery cable shows- would a bad alternator cause light to come on?
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