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International Automotive Technicians Network
Re: GM 4 wire alternator test tip
Posted to Technical Tips Forum on 2/2/2012

Jeff, exciting the "L" terminal on the 4 wire GM regulator will excite MOST of these GM alternators. However, it will NOT excite ALL of them, so be careful because you could be fooled.

It is also possible to excite the "L" terminal with a 500 ohm resistor co... Login to read more.