Voltmeter drops to 9
09-05-2009, 04:17 PM
#1
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Model: Cherokee
Voltmeter drops to 9
We have a 1998 Jeep Cherokee. The voltmeter drops to 9 when we drive the jeep. By stopping, turning off the car then starting it up again, the voltmeter returns to between 12 and 14. It may or may not happen again while driving. The problem is intermitent, but seems to be happening more often. What's the problem?
09-05-2009, 04:24 PM
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Year: 1998
Model: Cherokee
Engine: 4.0
We have a 1998 Jeep Cherokee. The voltmeter drops to 9 when we drive the jeep. By stopping, turning off the car then starting it up again, the voltmeter returns to between 12 and 14. It may or may not happen again while driving. The problem is intermitent, but seems to be happening more often. What's the problem?
09-05-2009, 06:52 PM
#5
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Welcome to CF.
Hey Blue, do those 98s still have the voltage regulator in the alternator, or does the ECM regulate voltage?
Hey Blue, do those 98s still have the voltage regulator in the alternator, or does the ECM regulate voltage?
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09-05-2009, 10:55 PM
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09-05-2009, 11:01 PM
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Year: 1998
Model: Cherokee
Engine: 4.0
Air ConditioningAnti-Lock BrakesAnti-TheftComputer Data LinesCooling FansCruise ControlDefoggerDoor LocksEngine ControlsExterior LightsGround DistributionHeadlightsHornsInstrument ClusterInterior LightsMirrorsPower DistributionPower WindowsSeatsShift InterlockSound SystemsStarting/ChargingSupplemental RestraintsTransmissionsWarning SystemWiper/Washer
what wiring diagram is it under? ill get it
what wiring diagram is it under? ill get it
09-05-2009, 11:10 PM
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Year: 89
Model: Cherokee
Engine: 4.0
The pcm handles the charging of the battery and monitors battery temp,there is a sensor located next to the battery tray. the evr located in the pcm also monitors line voltage,if the evr goes bad you have to replace the pcm to fix charging problem.
Next time this happens check voltage at battery with dvom and compare,it may just be a bad guage.
If I remember right chrysler switched to the pcm for voltage control in 91 when they switched to the chrysler control system and away from the renix.
Next time this happens check voltage at battery with dvom and compare,it may just be a bad guage.
If I remember right chrysler switched to the pcm for voltage control in 91 when they switched to the chrysler control system and away from the renix.
09-05-2009, 11:11 PM
#13
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Air ConditioningAnti-Lock BrakesAnti-TheftComputer Data LinesCooling FansCruise ControlDefoggerDoor LocksEngine ControlsExterior LightsGround DistributionHeadlightsHornsInstrument ClusterInterior LightsMirrorsPower DistributionPower WindowsSeatsShift InterlockSound SystemsStarting/ChargingSupplemental RestraintsTransmissionsWarning SystemWiper/Washer
what wiring diagram is it under? ill get it
what wiring diagram is it under? ill get it
09-05-2009, 11:17 PM
#14
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Year: 1998
Model: Cherokee
Engine: 4.0
i got a secret for you....online
go to http://www.powerlibrary.net/Remote/R...?ID=Kaltreider
24002000255222
then
- Auto Repair Reference Center
then again
Auto Repair Reference Center
wallah online everything!!!!!!!!
go to http://www.powerlibrary.net/Remote/R...?ID=Kaltreider
24002000255222
then
- Auto Repair Reference Center
then again
Auto Repair Reference Center
wallah online everything!!!!!!!!
09-05-2009, 11:31 PM
#15
CF Veteran
OK Joanne, I think I have an answer for you. It looks like according to my wiring diagram that the ECM, or computer if you prefer, controls the voltage on the alternator via a black and green wire. I would suggest that you take that plug off and clean the contact areas up with some electrical cleaner and then put it back. If that doesn't fix it, you may have a problem with the computer. The only way to fix those is to replace them.