I have a brand new alternator in 2011 jeep liberty and good battery. Alternator still not alternating current to battery?? replaced alternator and battery twice all connections look good. any ideas??

Asked by Aug 26, 2017 at 02:51 PM

Question type: Maintenance & Repair

4 Answers


All your grounds good? Body of alternator, engine, car body? All connections tight? No rust or corrosion? Have you done a voltage drop test on wires? Not just resistance but voltage drop. Could have gotten a bad alternator? PCM bad? Newer cars the computer runs the alternator.

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Did you use the preset saver tool before removing the battery? If not then you will need to go to the dealer and have the system reflashed before the charging system will even turn on, you may also notice some of your other accessories will not work. Runs a hundred bucks in my area.

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all connections are good . i think i need to go to a dealership to have a diagnostic run. its acting weird when i rev the engine pas 300 rpm it will start climbing on its own and i have to manually shut vehicle off or it will accelerate to its max...


Thanks for the points. If you engine speeds are acting like that then yes you need to have the systems checked, hopefully you don't have a bad processor.

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