Alternator fail
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More Turbo
Joined: Nov 2014
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Alternator fail
I got my batteries, starter and alternator checked today. Batteries and starter are good and alternator failed volt regulation (?). I replaced it and still same thing.. I have a mechanical volt gauge and at idle it is barely putting out 12-13 volts. To my understanding this should be about 14 (?). I did notice the alternator belt flaps around but I have read that it's actually normal. Is there a bad wiring somewhere? Or am I just looking at getting a warranty?
Edit: 91 f250 7.3
Edit: 91 f250 7.3
Elder User
Joined: Feb 2008
Posts: 867
Likes: 3
From: North Bend
X2
Voltage regulator is square boxy thing on the flat metal pan behind the passenger battery. Has 4(?) wires coming out of it.
If all you want is a regulator, upgrade to one that pumps out like 14.2v. Stock is pathetic.
I wish I could link it but another member years ago suggested that, cause he'd done it. He loved it.
I went with the 3g alternator upgrade, which moves the regulator inside(or at least on-board) with the alternator. That alt pumps out over twice the amps of the Stock unit, with light wiring involved.
There are a few good write-ups already out there, just search for them.
Voltage regulator is square boxy thing on the flat metal pan behind the passenger battery. Has 4(?) wires coming out of it.
If all you want is a regulator, upgrade to one that pumps out like 14.2v. Stock is pathetic.
I wish I could link it but another member years ago suggested that, cause he'd done it. He loved it.
I went with the 3g alternator upgrade, which moves the regulator inside(or at least on-board) with the alternator. That alt pumps out over twice the amps of the Stock unit, with light wiring involved.
There are a few good write-ups already out there, just search for them.
Thread Starter
|
More Turbo
Joined: Nov 2014
Posts: 618
Likes: 7
X2
Voltage regulator is square boxy thing on the flat metal pan behind the passenger battery. Has 4(?) wires coming out of it.
If all you want is a regulator, upgrade to one that pumps out like 14.2v. Stock is pathetic.
I wish I could link it but another member years ago suggested that, cause he'd done it. He loved it.
I went with the 3g alternator upgrade, which moves the regulator inside(or at least on-board) with the alternator. That alt pumps out over twice the amps of the Stock unit, with light wiring involved.
There are a few good write-ups already out there, just search for them.
Voltage regulator is square boxy thing on the flat metal pan behind the passenger battery. Has 4(?) wires coming out of it.
If all you want is a regulator, upgrade to one that pumps out like 14.2v. Stock is pathetic.
I wish I could link it but another member years ago suggested that, cause he'd done it. He loved it.
I went with the 3g alternator upgrade, which moves the regulator inside(or at least on-board) with the alternator. That alt pumps out over twice the amps of the Stock unit, with light wiring involved.
There are a few good write-ups already out there, just search for them.
Thread Starter
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More Turbo
Joined: Nov 2014
Posts: 618
Likes: 7
that is the diagram.
those are the pics of the wire on my truck. it looks to be a yellow wire.
thanks.
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More Turbo
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On the diagram it looks like it is supposed to be connected to the alternator?
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Elder User
Joined: Feb 2008
Posts: 867
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From: North Bend
Now that I zoomed in it looks like a 5th wire.
Are there 4 coming out of the plug, plus that one?
Looks like something that was intentionally left like that from the factory. I'd just run the new one and check voltage with a volt meter.
Are there 4 coming out of the plug, plus that one?
Looks like something that was intentionally left like that from the factory. I'd just run the new one and check voltage with a volt meter.
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More Turbo
Joined: Nov 2014
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There are only 4 including that wire
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More Turbo
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Correction you are right.
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More Turbo
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FIXED
the voltage regulator fixed it for me. as you can see you could say i needed a new one, lol. 
as expected my harness was toast..completely rusted so i just extending the wires a bit with butt connectors and used female end of a spade connector to connect to the spades on the voltage regulator. if you are going to do this be sure that you do one wire at a time to prevent putting the wrong wire in the wrong spot.
as always these forums have helped me fix my problem.
thank you all!!
as expected my harness was toast..completely rusted so i just extending the wires a bit with butt connectors and used female end of a spade connector to connect to the spades on the voltage regulator. if you are going to do this be sure that you do one wire at a time to prevent putting the wrong wire in the wrong spot.
as always these forums have helped me fix my problem.
thank you all!!
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