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**octaneman** · 06-08-2009, 10:22 PM

Hi jjkemp3

The external voltage regulator may need to be replaced, the bad part is on some models its located in the pcm on others it's external. Check the amperage on the new alternator it should be 90 or 124. Do a parasitic load test or with a test light check for shorts and see if the battery is leaking to another circuit. Check to see if your hood light drains the battery, sometimes the simplest things cause the biggest problems.

06-08-2009, 10:22 PM	#2 (permalink)
octaneman Mentor Home Support, Gearhead Automotive Center Join Date: May 2009 Posts: 544 OS: WINXP	Re: '88 Jeep voltage at 13.9 Hi jjkemp3 The external voltage regulator may need to be replaced, the bad part is on some models its located in the pcm on others it's external. Check the amperage on the new alternator it should be 90 or 124. Do a parasitic load test or with a test light check for shorts and see if the battery is leaking to another circuit. Check to see if your hood light drains the battery, sometimes the simplest things cause the biggest problems.