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Old 04-13-2017, 09:24 AM
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1999 Jeep Grand Cherokee limited charging

My 99 Jeep 4.0 Grand Cherokee limited gauges all day flight lights flicker I put new alternator DU Battery new computer and alternator still wants to charge at 19 to20 volts when wires plugged into back of alternator runs rough shuts off sometimes when I unplug the wires from the back of the alternator everything works fine but alternator doesn't charge where can I look to fix the problem?

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Old 04-13-2017, 01:45 PM
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Anyone know if a battery temp sensor is really something that would make the alternator charge? like that????
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Old 04-13-2017, 04:24 PM
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Re: 1999 Jeep Grand Cherokee limited charging

yes it bases charge rate on temperature of the battery

Battery temperature sensor
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Old 04-13-2017, 04:27 PM
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So that $35 part could solve the whole problem?
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Old 04-13-2017, 04:29 PM
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Re: 1999 Jeep Grand Cherokee limited charging

at this point it leads to it you have changed ECM, Alternator and Battery.
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Old 04-13-2017, 05:33 PM
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Crossing my fingers it does I will have one in the morning. If not I think my wife is Gona shoot me... Lol
I have never had a vehicle that had a battery temp sensor and I've always worked on my own vehicle never have I ever bin thrown for a loop like this.
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Old 04-14-2017, 02:02 AM
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Re: 1999 Jeep Grand Cherokee limited charging

The battery temp sensor will increase the charging voltage with lower battery temperature. But as far as I know it should never result in such a high voltage.
Did you check the voltage with an external volt meter?
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Old 04-14-2017, 04:34 AM
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Yes I did. As all my gauges in the dash lay flat zero so I checked from the alternator and battery..
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Old 04-14-2017, 08:44 AM
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I didn't get the part yet but if that don't work where else do I look?
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Old 04-14-2017, 06:22 PM
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Re: 1999 Jeep Grand Cherokee limited charging

So are all the instruments at zero all the time? If so, then it would point towards a PCI data bus problem. Almost all the modules "talk" to each other via this bus. The PCM sends voltage, rpm and fuel level info via this bus to the instrument cluster. If the bus is shorted or a module changes the bus voltage, the instruments will go to zero. But then also all instrument warning lights should come on. If they donīt, then it seems that the problem is with the PCM itself. It can be that due to a faulty battery temperature sensor (shorted for example), the PCM reacts with regulating the voltage too high. You could try and disconnect the sensor connector and see if the voltage returns to normal. Without the temperature input, the PCM will use a fixed value for this, just to be able to have the charging system working, even though in a down graded mode. (read: low voltage for a slow charging.)
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Old 04-14-2017, 06:26 PM
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Ok all gauges lay flat all light come on.
I just put new computer new battery new alternator new battery temp sensor in and it was ok for about 40 mile now it's doing it all again.
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Old 04-14-2017, 06:28 PM
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Code 1687 and 1686 now
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