The presence of the original alternator with 120k miles on it and plans for a modern audio system lead me to upgrade the alternator to the 70 amp version. The stock alternator is rated at 55amps. Baywindow campers, bay buses with the BA6 Eberspacher gas heater, or Porsche 912E's with A/C and sunroof had the 70 amp alternator. Richard Atwell describes the 70 amp conversion for a bus here. The process for a 411/412 is the same except I found that a longer belt was required. I used a 10mm x 980mm belt from Napa 25-7380. The alternator is a rebuild from ebay. The pulley, sheet metal, dust shield, and voltage regulator wiring harness are from a camper doner. The alternator wiring harness was rebuilt using parts of the original 412 harness, the bus doner harness (for the 70amp specific weatherproof voltage regulator plug), and a new 4 gauge power wire. The voltage regulator was also replaced with newer replacement Bosch unit (made in Spain), p/n 0-192-062-007.
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