Just had a similar problem with an Audi ... bad ground evidently stressed
out hall effect sensor and caused failure.  Voltage from sensor should
vary as motor turned slowly over by hand but you must tap into
wires/connection to live hall sensor to do this.  My Audi sensor has
three wires.  Don't know about vanagon sensor (my van has points).   May
not be your problem but good luck fixing.

George
1982 Westy bought new in '82

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