Neither is a 20 amp diode (just to be clear) The rating may not reflect the size if the efficiency is better on one than the other (Full spec sheet needed) If the small one excites the alternator, give it a whirl. The filiment in a usable idiot light is way smaller then the leads on either diode. 150 ma is the filiment current in the bulb that will excite the alternator to charge. Jim
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