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  #1  
Old 08-06-2016, 02:43 PM
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Electrical problem

I have a 97 wrangler with a 2.5 liter engine. The jeep will start and run. But the check engine light will come on and then the battery gauge will go from 13 to 9. I put a new battery in. I had the alternator tested and the serpentine belt is tight. I also removed the radio. I still can't figure out why it drops. Any suggestions?

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  #2  
Old 08-07-2016, 08:48 AM
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Re: Electrical problem

Welcome to the garage.
I donīt know the 97 wrangler, but is the voltage regulator inside the PCM, or inside the alternator?
I presume the voltage drops slowly from 13 to 9 and not suddenly?
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Old 08-07-2016, 09:24 AM
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Re: Electrical problem

Thanks for the reply. No. It drops suddenly. As soon as the check engine light comes on. It flys from 14 to 9. I will check to see were the regulator is located.
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Old 08-07-2016, 09:47 AM
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Re: Electrical problem

That sudden drop is quite strange, since the battery voltage will not drop like that. Do you have a volt meter to check the voltage on the battery itself? Is this indication the same as you have on the gauge?
I expect the regulator to be a part of the PCM and also the voltage indication comes from the PCM. Check the connectors on the PCM for moisture and/or corrosion (disconnect negative battery connection before removing the PCM connectors).
If this doesnīt help, remove the thick wire from the alternator and isolate it with isolation tape to prevent a short. If you now run the engine, what is the voltage indication?
Since the check engine light is on, is there any fault code set?
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Old 08-07-2016, 10:11 AM
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Re: Electrical problem

I seen on another site. A guy was having the same problem. It is the computer.
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