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I have 1992 F350 Crew Cab 4x4 XLT with just a hair over 336000 miles. I've been having a charging system issues. Back in Feb I replaced both batteries. About later the voltage regulator went out. I replaced it with BWD Select from O'Reilly. Shortly after that the alt went. I put a reman from O'Reilly. Since then I've had a overcharging issue and then a no charge issue. Took it an alt repair place and was told the was bad. Went got a replacement for it. After that no issues for about a month or 2. Then ended up with it not charging again. Took her back alt place, and said regulator this time. I replaced, and went through all the wiring and such couldn't find anything wrong with that. About a week ago it started over charging. I didn't get chance to mess with do to a injury. Today I put a new regulator in it. Go about 5 miles down the road and starts over charging again. Now I moved the mounting spot for the regulator. It does have a ground. At this point I don't know what to do besides taking it to a shop. I want to avoid it but I figured is ask here first. This is what it looks like going down the road as soon as left up on the petal it goes back to normal.
 

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We're not going to be much help without more & more-specific info from you. All the truck's details need to be in your signature so we can review them with each of your posts. Click this & read the caption:


(phone app link)


Pics of the alt, VR, & wiring would be good, too:
How do I post pictures, sounds, and or videos? | SuperMotors.net Forums | SuperMotors.net

Does this look like how your truck is wired?
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=9223

You haven't said exactly how you're determining when it's overcharging, when it's not charging, how you diagnosed each part as failing each time, and the brand/PN/source for each replacement each time.

These captions explain some common problems that CAN result in the symptoms you've described:


(phone app link)



(phone app link)



(phone app link)



(phone app link)
 

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I went through the same process with the '89 that I had. I finally bit the bullet, and replaced both alt. and regulator at the same time...no more trouble. It seems that one would take the other out, and by the time I found it and changed the bad component, the new one had started its demise.
 
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