08-21-2020, 10:21 PM
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Senior Member
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Join Date: Aug 2014
Location: Kirkland, WA
Posts: 172
Thanks: 1
Thanked 14 Times in 13 Posts
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Quote:
Originally Posted by edwardc
Screeching at startup, when the charging load is highest, is a pretty good sign of a worn belt. Replace it. Our 120A alternator puts out about 60A when starting with depleted batteries, which quickly tapers off to 30-40A. After 200-300 hrs of engine runtime, the belt will begin screeching at startup. A new belt cures it 100%. I always carry a spare.
Our big alt is only running at 50% of capacity (max), and even less normally, so it should run cooler and last longer.
Our external Balmar 612 regulator also has a "soft start" feature which ramps up the load slowly instead of slamming it on all at once, which helps the belt not squeal and last longer.
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the belt is fairly new (May) however it is the 26 inch. even with the longer bracket i cant seem to get it as tight as i would like 1/2" play with my finger. I tried a 25" belt but seems like it will go with some coercion but didnt.
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'69 Newport 30 MKI Hull #20
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