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Unread 06-04-2013, 08:36 PM   #1
craftworks125
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1996 ZJ 
 
Join Date: Jun 2013
Location: traverse city, michigan
Posts: 48
19 Volts after PCM replacement

Hi, i have a 1996 jeep grand cherokee limited with the 4.0L. I replaced my PCM with a junkyard unit two weeks ago to fix a no start problem. All was great until five days ago. I was suddenly getting nearly 19 volts ( yes i checked at the battery with a multimeter) when the jeep is running. This caused all of my gauges to go out on the dash. When i do something that draws power, ex turn on lights the guages will flash back on. I replaced my alternator today and it still does it My understanding is that the voltage regulater is in the PCM. Before buying another PCM could it be anything else????

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Unread 06-04-2013, 10:23 PM   #2
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,251
Not sure but be careful driving like that. I've seen batteries explode from overcharging when I worked parts.
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Unread 06-05-2013, 06:07 AM   #3
craftworks125
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1996 ZJ 
 
Join Date: Jun 2013
Location: traverse city, michigan
Posts: 48
Ya i know i am very scared driving it haha.... i have to though!
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Unread 06-05-2013, 11:10 AM   #4
HighLonesome
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1995 ZJ 
 
Join Date: Feb 2005
Location: New Mexico
Posts: 5,685
I would check the PCM connector for bent pins and anything else being awry. Give the connector pins a good cleaning with electronics cleaner.
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Unread 06-05-2013, 11:21 AM   #5
craftworks125
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1996 ZJ 
 
Join Date: Jun 2013
Location: traverse city, michigan
Posts: 48
Will do thanks!
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