Yo Jim,,,,,,,, When you say "The diode prevents discharging the battery" are you talking a diode OTHER THEN the one some people use in the GM 10 SI No 1 terminal excitation circuit??????????? I ask cuz that diode is installed forward bias you know so current can flow from a + battery source (like out of ignition switch when its ON) to the alternator (to excite it) but NOT reverse current from the alternator backwards (i.e. its one way check valve normal diode function). If the ignition switch is left on the battery will discharge via the coil and closed points to ground plus a smaller amount of current into the alternator but with the key off and no connection to the battery current doesnt/cant try to flow out of that No 1 alternator excitation terminal to the batterys positive does it (even if key was on it stil dont wanna flow to the + anyway correct) ??????? i.e I dont understand how that diode prevents battery discharge, I just see it as preventing a running alternator (NOT an idle one) from backfeeding the coil making it run with the switch off.
Buttttttt Im not really that much of an alternator guy, Im more into DC generators so talk me through this if possible
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