Question about 1983 Chevrolet Chevy

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Where does the red wire for the altenator come from??

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It comes from the key switch, to activate your altenator, if its the big red wire on the altenator on a lug byitself that one goes to the + side of your battery to charge your battery. the small ones on a plastick plug will plug in on the side of your altenator that is your switched side to activate your altenator.

Posted on Aug 24, 2010

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Battery light comes on and off and computer says service charging system and battery not charging sometimes when I first start the engine its fine but after awhile battery light comes on and battery not...


what you need to do is check the altenator for voltage it should be between 13 and 15 volts this is easily done with a standard volt meter check it at the altenator witch is located right on top of the engine on the back of the altenator there is a thick red wire that is where you want to put the positive and just put the black wire of the volt meter on the case of the altenator and check the reading it sounds like the altenator is bad there is also a fuse you should check your owners manual for location of the fuse also have your battary checked this should help ant questions just ask me

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Tip

Starting and Charging


All starting systems are basically the same in operation for manufacturers. The starter takes power from the battery to crank the engine. Generally the large wire on the starter is from the battery and the small wire is from the ignition switch. The large wire will have battery voltage on it all the time, the small wire will only have voltage when the ignition key is turned into the start position.

The altenator on all vehicles is designed to provide power for all car electronics while the engine is running, there is a large wire (usually red) that comes from the battery, and two to three small ones that come from other circuts to regulate how much power comes out on the large red wire.

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Disconnect the battery
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Sounds like the alternator may be missing an excitation current source.
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sir , the altenator has 3 wires at the connector correct ? a white/red , a green/white and a black , the white/red wire is involved with a 10 amp fuse to do with the charging meter / gauge , the fuse located behind left side of dash .. the green/white wire is is involved with 2 fuses , a 10 amp ECU fuse and a 25 amp Main fuse located at left rear of engine compartment main box , and the black wire is involved with a main 80 amp fuse at the main box also . both of these 2 wires end up at the positive side of the battery , please verify all these fuses are good . if they are indeed good , then open wiring would be next step verify continuity on black and the white/green wires . i would post a link to diagram but autozone repair info site is down at this time . if ya need more help , please ask .

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