Alternator. And unlike prior generations of Bosch alternators you can't replace just the regulator, which is usually what fails. Gotta buy the whole piece.
Cons: can't replace regulator
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I bought a Bosch rebuilt alternator from ECStuning and installed it last night. The light however has stayed on.
Cons: light stayed on
Vehicle:
BMW
My Lucas 18ACR (43 Amp) died shortly after I installed a big electric fan (I moved to Texas and felt it was a good idea), so decided to go with a higher output Bosch. I got tired of searching the parts shops (Advance Auto etc.) for a reconditioned Bosch that might or might not fit... In the end, I took my Lucas to an alternator shop and asked for a Bosch that would fit without modifications.
Pros: fit without modifications
Cons: searching parts shops
Part number: 18ACR
I wasn't crazy with the AC Delco (GM) alternator conversion when I used it on my MGB engine. The Bosch ones seemed to be a little better designed and easier to convert, plus they looked simmilar to the Lucas ones.
Pros: better designed, easier convert
Cons: wasn't crazy with AC Delco
Vehicle:
MG MGB
New Bosch installed Thanks for your help. It was in fact the alternator. Had a NEW Bosch installed by M&M Auto/Cycle in Jersey . Mikes the man when it comes to TDI service.
Pros: Alternator fixed the issue
Vehicle:
Volkswagen Jetta
Order a 6 groove 120A alt though. It's an easy no brainer update. The car benefits under heavy loads and startup. Rainy days when the lights, wipers, a/c, heater, seat warmers, etc are all running will be worry free and your battery will charge back up with less drive time.
Pros: easy update, worry free
Vehicle:
Volkswagen Corrado
Voltage regulator is built into the alternator. If you're seeing 14.5 V with the engine running it's as good as it is going to get.
Pros: 14.5V engine running
Vehicle:
Volkswagen Corrado
ran this one a bit in my 88 16v scirocco. works fine. a bit biger than the sotch as far as size.
Pros: works fine
Cons: a bit bigger
Vehicle:
Volkswagen Scirocco
Bosch rebuilt alternators are like $175 online. Lots of people experienced low quality rebuilts. Have people had good luck with Bosch rebuilts?
Cons: low quality rebuilts
Vehicle:
Volkswagen Golf
A few hard lessons I learned: Have a voltmeter and ensure your battery is good, a bad battery will kill a good alternator (12.6V min on non running car) Find a reputable guy that rebuilds starters and alternators and try to get your alt rebuilt or find a new Bosch.
Pros: rebuild or new Bosch
Cons: bad battery kills alternator
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