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Altinaitor not charging. Code keeps switching from alt to low gas to bat

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Try this, turn on your car once on leave on but unplug battery if the car turns off as soon as you pull the wires then your alternator is no good...if it stays on then it's going to be the battery

Posted on Dec 08, 2016


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New battery not charging after changing the alternator

First make sure both battery cables are free of corrosion and ground is secured to chassis and engine then check to see if theres an alt. fuse or bat. fuse blown. Another way to test charging sys w\out an meter is to remove the ground terminal from the bat. with the car running, if the alt. is good car stays running, if all else fails take the alt and bat to a parts store that will test them for free

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You may have a a/c voltage leak comming from the alternator..If its a rebuilt alternator sometimes you get a bad one ..But make sure all your connections are good ecspecially the small wires coming out the back ..These are the field and sensor wires..Plus make sure all your grounds on the vehicle are not broken or missing..You can have good voltage but it may have a drop going to the computer because of a ground and cause the light to come on

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Battery on full charge then start truck drive to town and noticed volt gauge at low turned lights and access off got home shut truck off tried starting after shut down and noting but dead bat havn prob...

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Alternator wiring im trying to by pas a volt. reg. to charge a bat. witch wire do i splise strait to the bat. for charge

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the engine computer is the regulator for the alt.

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1 Answer

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1 Answer

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1 Answer

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1 Answer


if you have a 3 wire Alt :
you have to hot to the Bat.

than # 1 of the 2 pins goes to a switched hot (NOT to the Dist. the car wont turn off) this is what turns on the Alt. charging system
the #2 goes to the charging lamp on the dash

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