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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Voltage issues

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Old Oct 19, 2010 | 03:11 PM
  #1  
bonzy's Avatar
bonzy
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Voltage issues

I have a passed down 1994 F-150, 300 six, that is acting up recently. When I start it the voltage meter reads on the low end, if I drive it it will continue to drop until ultimately the truck shuts off. On the other hand if I let it idle at start up for about 20 mins the volt meter will suddenly jump to normal and all is fine, she runs like a champ. Like I said it was passed down to me so I don't know the full history of the truck but do know the alternator was replaced less than 3 years ago.

I have changed batteries and my next move would be the alternator, even though it is less than 3 years old.

Any other ideas before I go spend $100 would be greatly appreciated!!
 
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Old Oct 19, 2010 | 03:20 PM
  #2  
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Grubbworm
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Joined: Apr 2010
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From: Acworth, GA
Try this, it might help you isolate the problem;

 
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