1989 ford bronco engine will not hold a charge, will start if jumped but dies if lights are turned on

1989 FORD BRONCO
99,000 MILES
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LIZ_SILVA79
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I have changed battery cable, starter relay. looking for what I should check next.
Dec 20, 2011 at 5:09 AM
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CJ MEDEVAC
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DO YOU KNOW HOW TO TEST BATTERY VOLTAGE WITH TRUCK OFF---AND WITH IT RUNNING, AT THE BATTERY POSTS WITH A VOLTMETER?

LETS SEE WHAT YOU HAVE FOR RESULTS

LOOK THIS OVER TOO

https://www.2carpros.com/questions/1989-ford-bronco-get-truck-start-key

YOUR TURN

THE MEDIC
Dec 20, 2011 at 5:18 AM
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CARADIODOC
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The generator is what keeps the battery charged after starting the engine. Use an inexpensive digital voltmeter to back-probe the wires through the plug and tell me what you find when the engine is running, and the wire colors.
Dec 20, 2011 at 5:19 AM
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CJ MEDEVAC
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THIS MAY HELP TOO

http://www.youtube.com/watch?v=dq24oPUVmdA

THE MEDIC
Dec 20, 2011 at 5:20 AM