Keith, I dont see a diode as furnishing much overcurrent protection on the GM 10 SI 3 wire alternators excitation circuit. In the forward bias ON mode while it has a 0.6 voltage drop, theres very little other current limiting protective resistance. Its most used purpose is to prevent backfeeding the coil so the engine stops when you turn the ignition off. To provide some degree of current limiting protection for the excitation circuit I recommend a 10 ohm resistor in which case the diode isnt usually even needed. When you use an idiot light in that circuit its even higher then 10 ohms resistance which still provides sufficient excitation current with plenty of protection and NO DIODE is required then either. True, Ive seen them wired with diodes or no diodes and no resistance at all n they worked n excited just fine butttttttt being a conservative Id opt for at least 10 ohms of current limiting protection (or the higher ohms idiot light) and usually the diode (which offers little protection) isnt even needed........
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