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Unread 10-20-2007, 07:23 PM   #1
AR-Guy
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2006
Location: Texas
Posts: 82
Electrical, battery and/or alternator headaches…

Ok being the newbie I am in the electrical area I need help!!! (Yep did a search but I think I am more confused after reading all of those posts!)


Data: ‘87 YJ, 4.2l, nutter, HEI, and an Empi 32/38 carb (New red top battery and power master alternator 90/140).

Ok old alternator went bad so I replaced it with the power master alternator 90/140 and a new red top battery; it had tested bad/weak also.

My dash battery gauge had been way down in the red (8), after replacing everything and starting it back up the dash gauge is reading at just around the 14mark. It sat a couple of days sitting (had to work) go back to start he back up and she does no problem. BUT the dash gauge reads just above the red (8) mark. That is until I add just a bit of gas then it goes back up to where it was at just around the 14 mark on the gauge. (From around 650 rpm idle to 850 rpms)

Ok so is that normal?

If not why not.

Just kick up the idle: really that easy.

I am worried that I have an electrical short (that does not sound fun.)

Suggestions, comments.

Thanks for help in advance!
Buck

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Unread 10-20-2007, 08:05 PM   #2
NJeepyj91
Registered User
1991 YJ Wrangler 
 
Join Date: Feb 2007
Location: NJ
Posts: 512
After about 16 years I am very biased against anything factory gauges tell me.

Old school. When an anemeter failed to register it was the internal voltage regulator which was going. If ignored, output would destory the alternator/generator.

New school: The gauges in the yj are not built to last and should not be trusted.

I went 15 years with no reliable gui. Gas gauge from hell. Annemeter lied all of the time. Oil pressure maxxed at 100 lbs of pressure at idle; no coolant temp since 1992.

Old school: It is the sending unit

New school: The gauge cluster sucks from poor design.

Take one of your circuit boards fom your PC. Leave it out for the summer on your dashboard. Plug it back it in and expect it to work.

That ribbon circuit board is the worst thing ever. Please don't be irritated with me. How many jeep engines could have been saved if there was some sort of early warning? The temp gauge comes to mind.
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Unread 10-20-2007, 08:24 PM   #3
AR-Guy
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1987 YJ Wrangler 
 
Join Date: Aug 2006
Location: Texas
Posts: 82
Quote:
Originally Posted by NJeepyj91
After about 16 years ...
That ribbon circuit board is the worst thing ever. Please don't be irritated with me. How many jeep engines could have been saved if there was some sort of early warning? The temp gauge comes to mind.

I'm not irritated I even more confused?

OK: Change out gauges I think thats smart and sounds good.

So no worries???
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Unread 10-20-2007, 08:58 PM   #4
frankmurphy
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1989 YJ Wrangler 
 
Join Date: Jul 2006
Location: nj
Posts: 59
You might just need to tighten the belt, my gauge was saying i was getting about 8 volts and when id give it gas it would go up to about 12-13 and it was squeking bad during start up, i tightened the belts, no more squeek and now the gauge stays around 13-14.
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Unread 10-20-2007, 09:14 PM   #5
AR-Guy
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2006
Location: Texas
Posts: 82
I did test that but it seems tight. The PO hand made a new alternator bracket and it is not in line with the other belts so getting an new bracket is a top project.

You can check it it out in my galary:

http://www.jeepforum.com/gallery/bro...4&userid=88001

Thanks again....
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