Goofy Charging System
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Senior User
Joined: Mar 2006
Posts: 175
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From: HALLSVILLE TEXAS
Goofy Charging System
Just got a 89 f250 and the charging system works as long as the voltage stays above 12.5 volts but if it drops it quits charging. Any idea? alternator test shows that it is putting out 87 amps under load, but it quits if the voltage drops.
Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
Likes: 3
From: Ladner, British Columbia
If the altinator put out full amps when you put 12V on the "Field" connections then usually it is the voltage regulator that is the problem. I think the box is located somewhere around the passenger side fender. Funny never had any problems with one yet, amazing how you take the things that work for granted.
Seb....
Seb....
Senior User
Joined: Jan 2006
Posts: 303
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From: Bertha Minnesota
Not to steal the post but my neibor has a problem with his 7.3 eating up voltage regulators. What would cause this? He put new batteries in but he says they don't last maybe 3 months. He keeps a couple in stock so he can change them out fast.
Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
Likes: 3
From: Ladner, British Columbia
1, Check and make sure nobody has tied in any accessories into the charging circuits especially the circuit going to the field of the altinator.
2, Make sure the voltage regulator box is properly grounded. Some of those grounds around the passenger side fender can be pretty shacky (corroded, etc...). Test the ground with an Ohmmeter, there should be no resistance back to the negative terminals on the batteries.
3, Did he use the proper replacement batteries?
4, Check the charge wire and battery cables, make sure they are not burned or partly melted at or near any of the connections.
Seb....
2, Make sure the voltage regulator box is properly grounded. Some of those grounds around the passenger side fender can be pretty shacky (corroded, etc...). Test the ground with an Ohmmeter, there should be no resistance back to the negative terminals on the batteries.
3, Did he use the proper replacement batteries?
4, Check the charge wire and battery cables, make sure they are not burned or partly melted at or near any of the connections.
Seb....
