Waterboxer Vanagons used 2 almost identical alternators over the years. 
The only important difference is the way the blue wire hooks up. On the 
newer version, you need to connect the blue wire to the small threaded 
stud, next to the large stud where the red wires went. I usually make an 
extension of the blue wire with a male spade on one end of a 3" wire and 
a small ring connector on the other end. Plug the extension into the 
existing blue wire and then put the ring end under the small nut. This 
extension allows you to switch back and forth to either version of the 
alternator.

Mark

kazzpar007 wrote:

>Hi my 85 vw vzns alt light came on. I went to the local pep boys here in delawareand the replacement one has an addition 12v terminal post on it. I'm assuming its for the camper accesories and such (mine is a standard van). BUT the blue wire that plugs into the back from the harness has no where to go. The are 3 male blade type connections on the back. One with an plastic shiel around it located on the opposite side from the 12v post. and one on the 12v post and one just below the 12v/ post. On the old Alt i removed a small black squared thing mounted with a single screw, with a sing wire connecting to a similar blade type connector on the back of the alt. DOES anyone know what this is? its about the size of a quarter. I plugged my blue wire to the blade connector to the farthest side blade on the alt, but the dummy light came on bright. so i put it on the 12/v post blade. Is this correct? can anyone help me? 
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