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

Tiny
LIZ_SILVA79
  • MEMBER
  • 1989 FORD BRONCO
  • 99,000 MILES
I have changed battery cable, starter relay. Looking for what I should check next.
Tuesday, December 20th, 2011 AT 5:09 AM

3 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
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

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Tuesday, December 20th, 2011 AT 5:18 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,742 POSTS
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.
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Tuesday, December 20th, 2011 AT 5:19 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
THIS MAY HELP TOO

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

THE MEDIC
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Tuesday, December 20th, 2011 AT 5:20 AM

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