voltage regulator
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Joined: Nov 2008
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voltage regulator
86 f-250 5.0:
my truck keeps killing the battery so i just took the alternator out and cleaned the brushes and what not. then took it to napa to get checked. they told me it was good. and the truck dies as soon as you disconnect the battery. so i was wondering if you guys think its the volage regulator?
my truck keeps killing the battery so i just took the alternator out and cleaned the brushes and what not. then took it to napa to get checked. they told me it was good. and the truck dies as soon as you disconnect the battery. so i was wondering if you guys think its the volage regulator?
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Joined: Jan 2001
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From: Virginia
While the engine is running, check the voltage on the "f" terminal of the regulator. If you have voltage on the "f" wire, then the regulator is working.
A lot of times people work with and around the alternator without disconnecting the battery. They will get against the output wire and blow the fusible link. To see if this is blown, with the engine off, check to see if you have battery voltage on the large output wire on back of the alternator.
A lot of times people work with and around the alternator without disconnecting the battery. They will get against the output wire and blow the fusible link. To see if this is blown, with the engine off, check to see if you have battery voltage on the large output wire on back of the alternator.
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Joined: Mar 2007
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<P>
</P>
<P> franklin2 i did all this with my starting problem that i had thought it might be the regulator but i had good volts from all points u said to check<IMG border=0 alt=0 src="http://images.ford-trucks.com/forums/images/smilies2/mad0228.gif" smilieid="63">why cant this be easy...</P>
While the engine is running, check the voltage on the "f" terminal of the regulator. If you have voltage on the "f" wire, then the regulator is working.</P>
<P> </P>
<P>A lot of times people work with and around the alternator without disconnecting the battery. They will get against the output wire and blow the fusible link. To see if this is blown, with the engine off, check to see if you have battery voltage on the large output wire on back of the alternator.
<P> </P>
<P>A lot of times people work with and around the alternator without disconnecting the battery. They will get against the output wire and blow the fusible link. To see if this is blown, with the engine off, check to see if you have battery voltage on the large output wire on back of the alternator.
<P> franklin2 i did all this with my starting problem that i had thought it might be the regulator but i had good volts from all points u said to check<IMG border=0 alt=0 src="http://images.ford-trucks.com/forums/images/smilies2/mad0228.gif" smilieid="63">why cant this be easy...</P>
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
I think that it may be the plug going into the alternator is shorted internally.
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what does that mean??? this is the post i started on it https://www.ford-trucks.com/forums/7...tart-help.html
if ya could help out anyway that would be great i have checked grounds & fuse links
srry willcharl for highjackin your post
if ya could help out anyway that would be great i have checked grounds & fuse links
srry willcharl for highjackin your post
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Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
If it has the long 3 wire (2 big wires, output, and one small, )plug in addition to the D shaped plug, there is a lot of problems with the plug going bad. They used to come with reman alternators. Should be available through local aftermarket parts store.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
Jeesh, I don't know where the link I posted above came from.
Sorry.
https://www.ford-trucks.com/forums/s...3&postcount=13
Sorry.
https://www.ford-trucks.com/forums/s...3&postcount=13
Cargo Master
Joined: Apr 2003
Posts: 2,058
Likes: 424
From: Too close to Houston
Don't do that. Disconnecting the battery while the engine is running doesn't do nice things to the charging system or electronics.
Gla you found the problem and were able to fix it.
Gla you found the problem and were able to fix it.
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