I got a Bosch reman (listed as Denso)... so far so good.
90% is the alternator: get a reman Bosch. The "squeaky serpentine belt" is actually the bearings inside the alternator on their last legs.
Check alternator voltage should be above 14V at 1500 RPM. Bosch alternators are crap anymore, I bought a new WAI global alternator, it has strong output so far. Only time will tell if it holds up.
I installed a Bosch re-manufactured unit. Under $200. It has a 24 month warranty and roadside assistance included.
Aftermarket units from Bosch and other are about $300.
The most expensive one at Rock is a Bosch for $186.79+ core.
Bought a new bosch alternator and installed it.
I'm swapping my 90a Valeo alternator for a remanufactured Bosch one. (Which actually says Valeo on it but has a Bosch part number and came in a Bosch box.)
Bosch has a high failing rate unfortunately not like the good old days.
Die neueren Generatoren sind heute noch Müll (Haltbarkeit). Musste ich erst in meinem A6 erleben (der zu meinem Glück noch auf Garantie ging). Im RS6 gehen die Dinger auch am laufenden Band flöten.
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