alternator won't charge
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Joined: Jan 2009
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alternator won't charge
To onefarmer and cOOnhunterjoe. Here's what I got. I bought a meter and tested the following wires. With the truck off and the key off I tested the battery's and got 10.82 volts, with the black on the battery and the red on the large post on the back of the alternator I got 10.58 volts. The 3 wire connector on the top of the alternator the left side wire was a yellow wire and it read 10.58, the middle wire which is the jumper wire back to the alternator read .05 volts and the right side wire which is green read 2.44 volts. I started the truck and was going to do the rest of the test and the truck died and will not start. The batterys seem to be dead again and they are new battery's. I removed the battery's to charge them and I tested them by themselves and they both read 10.25 volts. They are on the charger now. Did I do this right. Remember I have a 1997 f-350 ford dually with a 7.3 diesel
Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
i think i remember the truck, this is the one that has a new alternator that still wont charge?
you need to test the 3 wire connector with it unplugged from the alternator first. with it unplugged the first wire shuold read battery voltage as you said it does already, just double check it. the other outer wire should have 0 volts with the key off, then turn the key on and you should have battery voltage, check that first and get back to me.
you need to test the 3 wire connector with it unplugged from the alternator first. with it unplugged the first wire shuold read battery voltage as you said it does already, just double check it. the other outer wire should have 0 volts with the key off, then turn the key on and you should have battery voltage, check that first and get back to me.
Senior User
Joined: May 2007
Posts: 112
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From: ST JOHNS, MI
i think i remember the truck, this is the one that has a new alternator that still wont charge?
you need to test the 3 wire connector with it unplugged from the alternator first. with it unplugged the first wire shuold read battery voltage as you said it does already, just double check it. the other outer wire should have 0 volts with the key off, then turn the key on and you should have battery voltage, check that first and get back to me.
you need to test the 3 wire connector with it unplugged from the alternator first. with it unplugged the first wire shuold read battery voltage as you said it does already, just double check it. the other outer wire should have 0 volts with the key off, then turn the key on and you should have battery voltage, check that first and get back to me.
I'm concerned about the 10.8v at the battery. It should read a bit over 12v. Maybe the batt was already run down or the meter is off that much. Double check the meter by testing another vehicle.
Freshman User
Joined: Sep 2006
Posts: 49
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i think i remember the truck, this is the one that has a new alternator that still wont charge?
you need to test the 3 wire connector with it unplugged from the alternator first. with it unplugged the first wire shuold read battery voltage as you said it does already, just double check it. the other outer wire should have 0 volts with the key off, then turn the key on and you should have battery voltage, check that first and get back to me.
you need to test the 3 wire connector with it unplugged from the alternator first. with it unplugged the first wire shuold read battery voltage as you said it does already, just double check it. the other outer wire should have 0 volts with the key off, then turn the key on and you should have battery voltage, check that first and get back to me.
Thanks screech.owl
Laughing Gas
Joined: Feb 2009
Posts: 921
Likes: 1
From: Denver CO
Sounds like a bad voltage regulator to me. That'd keep it from charging. Especially w/ new batteries, they arent usually that expensive like $12, might want to take that of and get it chk'd most parts stores can do that for free.
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