On early model VW's (i.e. 1949-1974) it's a bit involved. You have to unbolt the plate between the generator and the fan housing, and remove the fan shroud itself. Also, I believe the generator stand may come with the entire assembly. Obviously, you'll want to take the air cleaner off to make more room for yourself to work. And, the hoses leading to the fan shroud have to come off. Visit www.thesamba.com or get a good manual for the bug from your friendly neighborhood parts store.
has an alternator
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your generator isn't charging. try replacing the brushes. if not then try thesamba.com and look for another generator.
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Go to the dealer.
By brushes, do you refer to the windshield wiper motor brushes, or the generator brushes? If generator...just replace the generator, or ramp up to an alternator. It is cheaper and a lot less hassle. If windshield wiper...well...that one is possible, but dreadfully difficult. Best to look for a replacement motor. I don't think they make the replacement brushes any longer.
under the stand for the generator where it bolts to the engine
on a type I vw beetle it is below generator pedastel