I have an 86 Blazer that had the old SI series alternator (2 wire plug). I dropped an 89 motor in it with the CS alternator (3 wire plug). I replaced the plug but it has the extra brown wire on it. According to Chiltons the brown wire goes to the indicator light, so I left it off since I have a Volt guage. The alternator does not charge the battery this way. The current plug wiring is:Black-ground, Red-12V, brown-disconnected. Does anybody know how this should be connected? The current alternator is brand new. Thanks for the help.