![]() It is also very important that the battery warning light works when you turn the ignition switch to the RUN position. Both of those wires should have close to battery voltage on them while the alternator is working. There should be two small wires going to a connector on the back side of the alternator. Its an open circuit and so remains unlit.Īnyone know if there is anything inside easily replaceable for this? Or ? I feel that the internals of the alternator are not providing a path to ground when i turn on the ignition. I get no alternator lamp on when turning the ignition on. Thanks for this! In this case, bulb test is NOT working then. Eventually alternator gives up and stops charging after many tens or hundreds of thousands of miles, light turns on) (Power from fuse box, power from alternator, meet in the middle at the bulb, neither can pass the other, no current flow means bulb is not lit, power struggle ensues, neither has an advantage. Once spinning, the alternator supplies a matching voltage to the pin which prevents current flow, so the bulb does not light. If the alternator is not spinning the pin acts as a ground path for the bulb circuit (power flows from fuse box to bulb to alternator to ground). (If this is how the bulb behaves, the circiut is working normally) The battery light comes on during the bulb test, then turns off after the engine starts. Others the engine has to start before they will turn off. Some turn on then turn back off after a few seconds. Cel, AT Temp, battery, oil pressure, seatbelt, etc. :-)īulb test is when all of the warning lights in the dash turn on when you turn the key to ON. Pin 1 is the pin closest to B+ terminal, correct? Grasping at straws here. But I really want that alternator light to work! (I'm OCD sometimes).Īnyone know if it's worth opening up and taking a look inside the alt? Or perhaps I'm missing something else? ![]() Otherwise it appears the alternator is working fine - putting out 15 volts or more when all wires are connected. It must be coming in through B+ terminal because no other wires are connected. You most likely will since the warning light isn't turning on and something inside the alternator isn't right.Ĭool - I just checked and found that on pin 1 with ignition on I get 5-6 volts. It appears that isn't happening so check the voltage on pin 1 with things connected normally and see if you see voltage there. When the alternator isn't running and the ignition is on then pin 1 should be at ground potential through the alternator circuit and the warning light turned on. Manually grounding that wire should turn on the warning light. Well it seems you have proved the wiring to pin 1 is okay.
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