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#1 |
Registered User
Join Date: Feb 2012
Location: Lynd, Minnesota
Posts: 201
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Factory AC alternator bracket
Guys with factory AC pickups. Do you have issues with the upper alternator bracket being flimsy and vibrating a lot? Mine on my 72 GMC wobbles/vibrates really bad at any engine speed over idle. Going down the road you can hear it vibrating. It's already cracked once but didn't break. The crack has been welded, and everything is as tight as it can be. Maybe it's the alternator? Is there a solution?
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Semi professional heavy equipment operator Amateur mechanic |
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#2 |
Registered User
Join Date: Feb 2012
Location: Lynd, Minnesota
Posts: 201
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Re: Factory AC alternator bracket
Anybody have any experience with this?
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#3 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: Factory AC alternator bracket
I don't think I've seen anyone else post anything like that. Try posting a picture of what you have. Is it safe to assume assume the A/C compressor is on the passenger side and the alternator is on the driver side? What year and engine?
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#4 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,395
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Re: Factory AC alternator bracket
I had an rpm dependent vibration in my non-AC gmc related to an alternator bracket, but it was the lower of the two brackets. The bracket lacked the bronze (?) bushing at the rear hole for the longer bolt.
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#5 |
Registered User
Join Date: Jan 2015
Location: Los Angeles California
Posts: 927
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Re: Factory AC alternator bracket
the original 1972 one year only brackets are the longest of the bunch, they do tend to flop around a bit and crack like you mentioned . The common fix it to get two, stack them and install with longer bolts to firm the whole thing up.
I believe the 72 vette uses the same bracket. |
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#6 |
Registered User
Join Date: Feb 2012
Location: Lynd, Minnesota
Posts: 201
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Re: Factory AC alternator bracket
Thanks for the replies guys. I'm in the black hills for the weekend, so I'll post some pictures when I get back. That's correct, the AC compressor is on the passenger side and the alternator is on the drivers side.
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#7 |
Registered User
Join Date: Feb 2012
Location: Lynd, Minnesota
Posts: 201
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Re: Factory AC alternator bracket
Here's some pictures. You can see where the alternator bracket cracked and was welded back together.
![]() ![]() It chatters quite a bit, especially when going down the road. I'm not sure if it is the alternator or the bracket.
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