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โAug-27-2015 09:16 PM
westend wrote:
Yesterday, I had my small utility trailer on the hitch of my 2003 F-250. I had dropped the trailer off and then put it back on the ball. Since it was near nightfall, I checked for running lights on the trailer. No luck. I messed with the 4X connector for a bit and finally gave up, choosing to leave the trailer until daylight. On the way home, the battery indicator and ABS indicator lit up on the dash display. I stopped the truck to inspect and barely got it restarted. I made it another two miles and the truck would not run.
This morning, I went back to truck with a fully charged battery, installed it, and made the 5 mile drive to home. All indicator lamps are now off but measuring across battery posts with engine running, I'm seeing 12.3V.
All symptoms point toward a failed alternator but this charging system has been flawless for 11 years. Is it possible that I blew a fusible link or some other circuit interruption instead of a failed alternator?
Anyone have any diagnostic tips for me?
โAug-27-2015 08:58 PM
โAug-27-2015 01:34 PM
Porsche or Country Coach!
If there's a WILL, I want to be in it!
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โAug-27-2015 09:24 AM
NinerBikes wrote:Niner, verified that there is no current between alternator and battery. Fusible links verified to have continuity (the two that I could find). AFAIK, voltage regulation is internal to the alternator. Don't know if there is a separate regulation module or not.
My basic test was start the motor up, then disconnect the negative side of the battery. Does it still run? Alternator is good, could be the voltage regulator. Does the motor die? Alternator is probably bad, test for output voltage and amperage, as well as voltage regulator.