Posted by John T on April 11, 2009 at 08:53:06 from (66.244.97.31):
In Reply to: diodes posted by archie3 on April 11, 2009 at 08:35:36:
This assumes you mean for use in GM 10 SI 3 wire alternator set ups to prevent ingition run on plus excite the alternator??????
Thats probably (not for sure, my best guess) too much resistance, if so the alternator may fail to excite as desired. That can also happen if you use an LED versus a more correct 94 incandescent marker lamp for an idiot light non charge indicator.
I suggest at least 10 ohms, maybe up to the 47 ohms range myself resistor instead of a diode, because the resistor can offer more safety current limiting protection, or else use a small incandescent idiot lamp, cuz it has the safety current limiting PLUS serves the idiot light purpose to identify non charging. OR DO AS BOB M SUGGESTED put a resistor in paralell with the idiot light so theres still current limiting protection plus the necessary alternator excitation in case the lamp burns out SOUNDS LIKE A WIN WIN BEST CASE SCENARIO
Dont get me wrong a diode will work, I just prefer a resistor or idiot light (incandescent NOT LED) or light in paralell with Resistor as noted by Bob M for the added current limiting protection.
If I missed anything hopefully the other fine gents will add to this
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