I am tracing the circuitry on a 1986 Ford F-250 truck voltage  
regulator.  There are four lugs emerging from the regulator and they  
are labeled I - A - S - F when reading them from left to right.  I  
have some guesses as to what they are for.  Can anyone use their way- 
back machine and tell me the function of each of these lugs.

Thanks

Cedric

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