99 alternator


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Old 08-17-2019, 11:04 PM   #1
vernons
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Default 99 alternator

on a 99 alternator, is the voltage regulator in the alternator on the computer? if it is in the computer, how do i repair this?
when i drive my jeep it will work normal for a couple of days, then the check engine light will come on and my volt meter will bottom out.
i took the alternator out and had it tested at two different places and it checked out fine.
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Old 08-18-2019, 12:26 AM   #2
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It is in the computer
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Old 08-18-2019, 06:31 AM   #3
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Ouch. Is there a way to a way to repair this without having to buy a computer
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Old 08-18-2019, 07:16 AM   #4
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So what is the code when the check engine light comes on?
First have to sort that out.
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Old 08-18-2019, 07:19 AM   #5
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After all the fun you've had pulling the alternator, i hate to say it but try tightening the belt.
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Old 08-18-2019, 01:02 PM   #6
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Default wait a minute

Quote:
Originally Posted by Ralph77 View Post
So what is the code when the check engine light comes on?
First have to sort that out.
i am trying to remember from 10 years ago, isnt there a way to check the code by turning off and on the key? i have done this before but it had been years ago

Last edited by vernons; 08-18-2019 at 01:10 PM.
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Old 08-18-2019, 01:10 PM   #7
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well that did not work. the check engine will not stay on. when i start the jeep, the gauge will show almost normal the drop to 9 and the check engine will come on. so i waited for it to do this and them tried to pull a code and still nothing.

problem is, it will not come on all the time. i drive it all week then it came on last night. drove it for an hour today and it came on close to home

Last edited by vernons; 08-18-2019 at 01:14 PM.
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Old 08-18-2019, 01:11 PM   #8
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Quote:
Originally Posted by S8NNG8 View Post
After all the fun you've had pulling the alternator, i hate to say it but try tightening the belt.
i was thinking that too, however i tightened it yesterday.
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Old 08-19-2019, 06:43 PM   #9
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you can pick up an ECM from a junk yard for around 40 bucks.
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Old 08-19-2019, 09:02 PM   #10
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That is what I would do
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Old 08-20-2019, 10:52 AM   #11
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Thanks. The pull a parts in my area are dry. The xj is getting hard to find.
I drove it an hour today with no problems.
Last week it was fine till Sunday.
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Old 08-23-2019, 11:14 AM   #12
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I had the codes pulled. I got a p03020 and a p1862
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Old 08-23-2019, 12:26 PM   #13
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Quote:
Originally Posted by vernons View Post
I had the codes pulled. I got a p03020 and a p1862
Are sure?
What little info I can find on P1862 does not even apply to the alternator.
Looks like something to do with tranny or TC thing.
Not even on this list.

https://www.quadratec.com/jeep_knowl...article-39.htm

Did you mean P0302?
Misfire on #2
Or did you mean P0320?
Looks like a CPS code.
P3020 looks like some hybrid car battery thing.
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Old 08-24-2019, 06:57 AM   #14
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P0320. Sorry about that. The guy who pulled the code mentioned something about camshaft sensor. I guess
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Old 08-24-2019, 07:26 AM   #15
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Quote:
Originally Posted by vernons View Post
P0320. Sorry about that. The guy who pulled the code mentioned something about camshaft sensor. I guess
I could be totally wrong about this but not seeing how either one of those codes could be affecting the alternator.

Unless maybe it is some low voltage thing?
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