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Bosch AL114X internally regulated 65 amp alternator for a '83 Volkswagen Vanagon 2.0 liter engine. My friend picked up one of these engines to rebuild and play with in his sandrail. Information was very hard to find on wiring it up, so I am posting this here to maybe help someone else since we figured it out.
The 2 large spade terminals where the connector would go are BOTH B+, as most of the Vanagons were camper style interiors VW decided to give an extra terminal for output capacity.
The small spade terminal D+ where the connector would go is the exciter / idiot light connection. This supplies ground when the alternator is NOT charging, and supplies 12+ when it IS charging. The other end of this circuit is a 12v incandescent bulb (NOT LED) which has 12+ to one side with the key switched on, and the ground side is a blue wire that leads to the small spade terminal D+ in the connector. The bulb lights when not charging, and goes out when the ground side also recieves 12+ from charging. This particular alternator NEEDS this exciter circuit to energize the alternator and allow it to initialize and start charging.
The only thing I am unsure of is the solitary spade terminal in its own hole to the left of the connector area, the one with the wire connected in this picture and leading to the small part labeled 2.2uF 100Volt.
I am guessing this is a current conditioner of some sort perhaps added to smooth out the peaks and valleys of the generated current for the EFI system? A capacitor or condenser of sorts.
Not all of these engines had them, in fact it seems that most did not from what I have personally seen.
The 2 large spade terminals where the connector would go are BOTH B+, as most of the Vanagons were camper style interiors VW decided to give an extra terminal for output capacity.
The small spade terminal D+ where the connector would go is the exciter / idiot light connection. This supplies ground when the alternator is NOT charging, and supplies 12+ when it IS charging. The other end of this circuit is a 12v incandescent bulb (NOT LED) which has 12+ to one side with the key switched on, and the ground side is a blue wire that leads to the small spade terminal D+ in the connector. The bulb lights when not charging, and goes out when the ground side also recieves 12+ from charging. This particular alternator NEEDS this exciter circuit to energize the alternator and allow it to initialize and start charging.
The only thing I am unsure of is the solitary spade terminal in its own hole to the left of the connector area, the one with the wire connected in this picture and leading to the small part labeled 2.2uF 100Volt.
I am guessing this is a current conditioner of some sort perhaps added to smooth out the peaks and valleys of the generated current for the EFI system? A capacitor or condenser of sorts.
Not all of these engines had them, in fact it seems that most did not from what I have personally seen.
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