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Ford voltage regulator.

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Brad

04-11-2001 19:35:23




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Does anybody know how to check a voltage regulator with a digital volt meter. I have a 1979 Ford F-350 4X4 and replaced the regulator about 2 months ago because the parts store tested it and said it was blown, and that was why my battery kept draining. Well the battery was "up" all this time until the truck sat for a week, now the battery is dead again. I'm wondering if my welder/generator on the flat bed is spiking my whole truck and blowing this sucker or what. It's the flat style Ford regulator with 4-5 flat metal tabs. I'd rather test it at home and save a trip to the store..... ....(you notice that when you go to a parts store there is always something wrong with what you give them to test??)

Thanks in advance.

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Jon Hagen

04-11-2001 21:34:12




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 Re: Ford voltage regulator. in reply to Brad, 04-11-2001 19:35:23  
To check if the regulator is working, check voltage at the battery posts. should read 13-1/2-15V with the engine running. To check if somthing is fused in the regulator and keeping the alt rotor energized which would run down the battery. Turn everything off in the truck and close the doors, then remove the neg bat cable and hook a 12V test light between the battery post and battery cable. If no light you should be OK, if it lights unplug the regulator to see if the light goes out. Interesting question if a truck mounted welder could zap the trucks electronics. gotta be some welders on this site that can answer that one.
The closest I have come to that was welding on a gooseneck trailer while still attached to the pickup. The ground clamp was on the trailer and I laid the stinger down in the pickup box where it shorted to the box. That 14 ga trailer ground wire doesn't take 150 amps worth a hoot. :-(

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