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 Alternator not charging enough
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Cowpatty69
Sitting Bull

USA
137 Posts

Posted - 28 Jun 2017 :  9:05:30 PM  Show Profile  Reply with Quote
So I thought I'd share this issue and resolution on the Frankenbird. While in the middle of the brake issue, all of the sudden the alternator output dropped from 14.4 to 12- on the gauge and with the voltmeter.
Checked the voltage across the battery at rest (12.2v) and had Benjamin start it-still 12.2v.
Pulled the positive cable while running- still ran
Took the alternator (6mo old) back and had it tested- tested fine
Swapped another alternator-same issue
Checked connections on starter, distributor, back of alternator, fuses- nothing out of the ordinary.
So if you search google, you get to chase down a bunch of rabbit holes.
So, to the point. I forgot the number 1 rule of checking the simple first. It was a glazed alternator belt that was slipping. Doh!
In my defense, my son did all the swapping of the alternators so I never touched the belt- but still no excuse. So I thought I'd post a reminder on checking the obvious! hope this helps someone some time!

Got Poncho?

Blued and Painted
Chief PONTIAC

USA
3405 Posts

Posted - 29 Jun 2017 :  10:31:08 AM  Show Profile  Reply with Quote
Nice fix.
I have also seen where a worn V-belt runs on the inside flat of the pully rather than in the V as designed.
A worn alt pulley/sheave will quickly shorten belt life.
Fortunately many re-man alternators come with a new pulley.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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