Question about 1988 Ford F 150
New bat and my charger shows 100 on alt but gauge shows discharge
Not sure I follow the story. The alternator is charging 100amps but the gauge shows less than 14 volts ? Is the alternator output at least 13.5 volts and is that getting to the battery ?
Posted on Feb 15, 2014
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Posted on Jan 02, 2017
The wiring burning up at the altenator most likely caused the diode inside the altenator to short out. I would just replace the altenator now.
Posted on Mar 18, 2009
intermittant start sounds like starter relay, 13.6-14.4 is still charging anything above 12.0 is charging, so that does not sound bad to me. I have a 99 F150 and have found all my problems were sticky relays
Posted on Mar 23, 2009
I recently went through a battery/charging episode. Not to sound like the wise-guy, But! try a good battery and see what kind of reading(s) you can get.
Let me know if this is of help to you.
Posted on Oct 01, 2010
Is this a new Alternator a rebuilt? If it is a rebuilt is it a Motorcraft OEM rebuilt? If it came from any of so called discount auto parts dealers I'd be highly suspect of the Alternator being the problem. What you are describing his a failing diode in the rectifier or a poor connection somewhere inside the Alternator. My own brother good 4 bad Alternators from Kragen and finally gave up and bought a ACDelco unit. This is not an uncommon story.
Posted on Sep 15, 2011
You may have a a/c voltage leak comming from the alternator..If its a rebuilt alternator sometimes you get a bad one ..But make sure all your connections are good ecspecially the small wires coming out the back ..These are the field and sensor wires..Plus make sure all your grounds on the vehicle are not broken or missing..You can have good voltage but it may have a drop going to the computer because of a ground and cause the light to come on
Posted on Sep 15, 2011
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