Question about 1985 Jeep Grand Wagoneer

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1985 Jeep Grand Waggoneer...360.. will not charge...has new alternator..lights surge...inside lights surge...any ideas?

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  • evoss124 Nov 12, 2010

    Can I check it on the car with a volt meter...and could you tell me how to do that...

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Probably a bad voltage regulator. Its a silver rectangular box with 2 wires going to it. It is normally mounted on the firewall or inner fender wall. roughly the size is 3in by 5in

Posted on Nov 12, 2010

  • Ron A Martinson Nov 12, 2010

    Well i did some more reseach and I guess the voltage regulator is in the alternator on this jeep so don't look for the box it wont have one. I would still have the alternator tested at a parts store even though its new. You might have got one with a faulty regulator in it. Also check to make sure the big wire that goes from the alternator to the battery has a good connection at the battery. Check to make sure the two smaller wires on the alternator did not get switch around somehow.

  • Ron A Martinson Nov 12, 2010

    Yes you can check it with a volt meter. Set you meter up so its reading volts. Test the meter on the battery while its not running by placing the positive lead (red) on the positive terminal and placing the negitive on the negitive terminal. You should get a reading of 11v-12v Then you know you have it set up right. With the jeep running this should raise up to 13v-14.5v . You can test it right at the alternator too by putting the red lead on the large wire on the alternator and putting the black lead anywhere it will ground and you should get the same reading. If you get a 13v-14.5v at the alternator and only an 11v-12.5v at the battery there is a problem in the wires somewhere. But if you only have 11v-12.5v at the alternator it probably faulty and should be further tested by a part store. Also if you have a volt gauge inside the jeep I have seen them go bad causing them not to charge. The gauge will ushally be slightly burnt on the backside where the wires connect if this is your problem.

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