John Graham wrote: > Can anyone tell me what the little round test plug with a rubber cap > on it > attached to the back side of my alternator is for? When you pear > inside > the plug, there is a male fitting with 3 small pins. I asked the VW > service advisor about it when I was there last week and he didn't have > a > clue. > > John Graham > 88 Westy > Charlotte NC If it is the same as mine you will see that the wire goes to a sensor to detect timing off or the flywheel. Probably used for computerized diagnostics. Mark '84 GL '81 Westy etc....
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