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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Can't keep the voltage regulated...

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Old Nov 6, 2002 | 02:46 AM
  #1  
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Can't keep the voltage regulated...

 
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Old Nov 13, 2002 | 12:13 PM
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Can't keep the voltage regulated...

My voltage with the engine running is about 15 volts at the battery and coil. I changed the regulator and it didn't help so I changed it again and it still didn't help. What could be causing this? If I unplug the regulator it goes down to 12.5V. Wiring seems to be decent so I don't suspect the short but its not impossible of course. Also there is a little black box between the battery and the solenoid. I would like to know what this is. It is very old and crusty but when I disconnect it nothing changes.
 
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Old Nov 13, 2002 | 04:24 PM
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Can't keep the voltage regulated...

I got it. It was the alternator of all things. I called my hometown mechanic/machinist and he said sometimes the diodes go bad in the alternator and will casue this even with a good regulator.
 
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Old Nov 14, 2002 | 11:11 AM
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Can't keep the voltage regulated...

Great! But what about the little black box? Ever find out what it is? I was thinking fuse or maybe a relay?
William in Atlanta
 
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Old Nov 14, 2002 | 11:30 AM
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Can't keep the voltage regulated...

It's the horn relay, unplug it and see if your horns work.

Barry
 
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Old Nov 14, 2002 | 05:34 PM
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Can't keep the voltage regulated...

[updated:LAST EDITED ON 14-Nov-02 AT 06:35 PM (EST)]What is the problem ? Your alternator should push about 14.5 v .
If you are using the old style regulator you can adjust the points and put the voltage where you like, but you need a little higher voltage to push a charge in the battery.
 
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