1 wire alt..
Lead Driver
Joined: Mar 2008
Posts: 7,184
Likes: 382
From: Near Los Angeles
old and new. You'll swap the pulleys over.
you'll lose all this below:
You'll need to add one of these, a 175 amp fuse.
Something like this:
Lead Driver
Joined: Jul 2017
Posts: 9,603
Likes: 1,174
From: San Jose, CA
The actual point of touching is supposed to ground the alternator case to the engine block. Then to the battery through the main ground cable connection. But if something on the back is touching, that's not exactly a "good" thing, but I don't see how it would cause the squealing.
In fact, belt squeal is a known commodity with some modern high-output alternator swaps. I hear more people complain about it with Ford alternators than do with GM versions, but not sure why. Haven't tracked the issue with 1-wire alts though, and was just discussing it today in a "meeting" wondering if 1-wire alts were as susceptible as 3-wire alts were.
F250 restorer's solution was the same thing I did on my Bronco. My F350 on the other hand, did not need it. I believe that it's due to the pickup's larger diameter factory pulley vs the smaller one that came on the Bronco.
A dual-groove pulley solved the issue. On the other Bronco I've got an Explorer serpentine conversion so it's never an issue on that one.
Out of curiosity then, which alternator did you go with? Love to see some pics.
Thanks
Paul
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