Catastrophe: Two shredded alternator belts in 24 hours.

Lesson Learned: When I spaced the pulleys apart, I failed to account for the change in the center-line of the pulley path, and very quickly shredded two belts. Belts slip, pulley heats up bearings seize from the heat.

Anyway, that damned rebuilt alternator was crap. couldn't get it to charge at low RPM. It's Thanksgiving weekend(CAN), and I need to replace the alternator.
With the bearing seized, pulley screwed, I remember that I have an engine with accessories in the garage at my parent's house. A M117.983 engine from a 75 SEL. The alternator is corroded, the center section is rusty, but it has a belt on it. It looks like it hasn't turned in 35 years Take the belt off, if feels seized. Tap lightly with a hammer and it come free.
Awesome.
I decide to bench it and take a look. Brushes still good, on both sides. I was happy to see that it was an original Bosch alternator with original Bosch voltage regulator. The belt was in pretty good shape too. So I took the alternator, belt and bracket w/ toothed bolt and put it on my engine.

Installed with old belt, fire it up and everything looks good, sounds good.

get out the multimeter. 13.8 throughout the ENTIRE RPM range. NICE
add load at loaded idle, and voltage only drops to 12.6 rather than 11.5 Nice

I will never buy another rebuilt alternator as long as I live.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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