Alternator replacement
Elder User
Joined: Dec 2004
Posts: 944
Likes: 0
From: Happy Valley, Oregon
I checked DCV at my alt and it was 13.83. The passenger batt was 13.50. The drivers side batt was 13.46. Truck was running and had been about 5 minutes.
Batteries were new this spring. Thanks for your help. Looking forward to any ideas.
Elder User
Joined: Aug 2010
Posts: 675
Likes: 1
From: NV
DC Power is the BEST way to go for an alternator IMHO.
Just for grins and giggles--with the truck running check one of your batteries for AC (not DC) volts and see if you have more than .3 or .4 vAC and post back?? Make sure that you have the leads the proper polarity on the VOM and battery. Doing some research here.
Just for grins and giggles--with the truck running check one of your batteries for AC (not DC) volts and see if you have more than .3 or .4 vAC and post back?? Make sure that you have the leads the proper polarity on the VOM and battery. Doing some research here.
Which brings up a question, if the AC voltage is a sign of rectifier failure can the rectifier board be replaced? Does Ford or someone sell it as a repair part?
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
The part is available. I checked on it yesterday. You just have to have a new rectifier installed. I think the repair out the door was about $70. The trick with these alternators is a (can't remember the exact terminology) small sleeve that goes in with the rear bearing that's VERY easy to break and normally has to be replaced. I have a good rectifier in an otherwise bad alternator I'm tempted to try. Not much to loose at this point.
Elder User
Joined: Aug 2010
Posts: 675
Likes: 1
From: NV
The part is available. I checked on it yesterday. You just have to have a new rectifier installed. I think the repair out the door was about $70. The trick with these alternators is a (can't remember the exact terminology) small sleeve that goes in with the rear bearing that's VERY easy to break and normally has to be replaced. I have a good rectifier in an otherwise bad alternator I'm tempted to try. Not much to loose at this point.
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
I got the information from a small shop here that rebuilds so no part numbers, sorry. So far all I've gotten about the AC volts at the alternator is that it's a non-issue but I'm still doing research.
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
So........after making a few phone calls and getting some answers that I must be crazy and didn't know WTF I was talking about I called and talked to the guy at alternator parts dot com. Super nice and knowledgeable fellow.
The bad news is that the diodes in the rectifier are failing and the results are that it will cause early battery failure as dchamberlain posted to me in another thread. The only cure is to replace the rectifier--cost about $40. I'll be ordering the xhd model rectifier and deal with it until then.
The bad news is that the diodes in the rectifier are failing and the results are that it will cause early battery failure as dchamberlain posted to me in another thread. The only cure is to replace the rectifier--cost about $40. I'll be ordering the xhd model rectifier and deal with it until then.
Elder User
Joined: Aug 2010
Posts: 675
Likes: 1
From: NV
Alternator repair
I found this site, they claim to use US components.
National Quick Start Sales, High output alternator, Alternator & Starter Parts - 6G (Large Case & Small Case)
They have parts and complete alternators, standard duty and up to 200A heavy duty. Ford Power Stroke 7.3L 6.0L 6.4L 6.7L Diesel Type High Output Large Case 6G Series Alternators
National Quick Start Sales, High output alternator, Alternator & Starter Parts - 6G (Large Case & Small Case)
They have parts and complete alternators, standard duty and up to 200A heavy duty. Ford Power Stroke 7.3L 6.0L 6.4L 6.7L Diesel Type High Output Large Case 6G Series Alternators
