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1994.5 - 1997 7.3L Power Stroke Diesel  

charging problem

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Old Mar 1, 2009 | 09:47 PM
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charging problem

got a charging problem on my 7.3 volt guage is reading just above the 8 mark (so almost no charge) usally when i start the truck it takes about a min then my guage clicks up to the half mark on the volt meter. now today it starts fine it just sticks low on the volt meter. like im getting no charge lights are dim but truck starts right up even in the cold i just replaced the starter about a month ago and help would be appericated.....
 
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Old Mar 1, 2009 | 10:31 PM
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Sounds like your alt has died. You just haven't run the batts down yet. Take the alt off and get it tested at Autozone or who ever is local for ya.
 
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Old Mar 1, 2009 | 10:50 PM
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thats what i was thinking also. ill go and test it tomarrow
 
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Old Mar 2, 2009 | 04:43 PM
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what amp alt dose the truck use? i went to the ford dealer today looking to get a new one they said there is 135 amp and a 215 amp alt. i was looking all around on mine and cant tell what amp it is. plus the 215amp alt was flipping $915 bucks where the 135 was like 200 bucks huge price difference. they didnt seam to know what the differecnce was between the 2
 
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Old Mar 2, 2009 | 04:50 PM
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Before you buy a new one you should check the wiring on the top of the alternator. They get mashed from laying on it while working in the engine compartment. Jiggle them while running, look at the wires on the back too.
The dealer prices will be higher than aftermarket no matter which one you get.
The 135 is good enough unless you plan on running a lot of electrical stuff off the truck.
 
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Old Mar 2, 2009 | 04:55 PM
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Originally Posted by Cuda_jim
Before you buy a new one you should check the wiring on the top of the alternator. They get mashed from laying on it while working in the engine compartment. Jiggle them while running, look at the wires on the back too.
The dealer prices will be higher than aftermarket no matter which one you get.
The 135 is good enough unless you plan on running a lot of electrical stuff off the truck.
ok i will give the wires a check before i buy a new one. thanks for the help
 
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Old Mar 2, 2009 | 06:03 PM
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No! don't just run out and buy a new one. Get the original tested first. That is after the wiring check.

Oh and check you're getting battery voltage to the big terminal on the back of the alt. I had the fusible links blow on mine when the alt went out.
 
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Old Mar 2, 2009 | 06:32 PM
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Originally Posted by onefarmer
No! don't just run out and buy a new one. Get the original tested first. That is after the wiring check.

Oh and check you're getting battery voltage to the big terminal on the back of the alt. I had the fusible links blow on mine when the alt went out.
got ya. i will go run and get it tested today.. is the fuseable link in line with the large wire on the back of the alt??
 
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Old Mar 2, 2009 | 06:46 PM
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Yes it is, on the other end of it. It really is two 12ga links y'd together and attached to the relay on the right(passenger) fender behind the batt. I dought it is bad, but if there is no power to the big wire on the alt that is the first place I'd look.
 
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Old Mar 2, 2009 | 07:00 PM
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Originally Posted by onefarmer
Yes it is, on the other end of it. It really is two 12ga links y'd together and attached to the relay on the right(passenger) fender behind the batt. I dought it is bad, but if there is no power to the big wire on the alt that is the first place I'd look.
i checked the large wire with a meter. got around 12v out of the back of the alt im going to get it checked at autozone..good charge is about 14v truck running right??
 
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Old Mar 2, 2009 | 07:39 PM
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From: ST JOHNS, MI
Originally Posted by drbigknuckles
i checked the large wire with a meter. got around 12v out of the back of the alt im going to get it checked at autozone..good charge is about 14v truck running right??
Correct....
 
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Old Mar 5, 2009 | 02:13 AM
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got it back on the road. took it to autozone they tested the alt found it was bad got a new one and works good now thanks for the help guys!!!
 
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