Re: Alternator drain? |
Subject: Re: Alternator drain? by Durango_Boy on 2009/2/11 13:46:14 First, test the battery voltage, with the car off, at both the battery and alternator and compare the readings. Then start the engine, and test at both the battery and alternator, again checking the readings. What are the two sets of voltages? Next, with everything off, disconnect the negative battery cable and put a test light between the end of the NEG cable and the NEG battery terminal. Does the test light illuminate? Go up to the alternator, and unplug the main harness plug and watch the light. Does it go out? Then remove the large gauge red wire from the battery lug, and see if the test light goes out. If it goes out the alternator is the drain, and probably had a bad diode trio. You can use the test light method to find any drain. Pull fuses one by one until the test light goes out. If none of the fuses do it, then using an AIM as a guide, pull every relay one by one, or courtesy light bulbs one by one, until the test light goes out. |