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Old 08-18-2013, 11:10 PM   #1
tmaxx19841's Avatar
Join Date: Jun 2012
Location: naples
Posts: 28
help wiring problem

Hi all im in need of some help. I have an 1989 yj 2.5l 5speed that the voltage drops with the head lights on. then as you add more to it, ie brake on turn signal lights and or heater and wipers. it will dim all the lights, and start to hesate and backfire and miss do to the lack of sterio works fine trough this. there is a newish battery its a year old, new altinator and new headlights. also changed the computer under the dash do to it stalling out. it drives fine during daylight hours soon as night comes it acts up. it has done this for a year sence I bought it last September but has only been on the road for 6 months due to the computer going bad. im am lost when it come to wiring

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Old 08-18-2013, 11:55 PM   #2
Jeeprich25's Avatar
Join Date: Sep 2010
Posts: 881
I'd grab a voltmeter and start checking for voltage drops at headlight plugs. Work backwards from there. Check grounds too.

1990 Jeep Wrangler YJ. 2.5L. Bone Stock, mostly.

"I'd have more money for upgrades if it didn't break every week."
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Old 08-19-2013, 06:21 AM   #3
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Join Date: Jul 2012
Location: south georgia
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check your voltage at the battery with jeep turned will probably read in the area of 12.5-13 volts if everything is cool..then crank it and should now read around 14 volts if alternator is working.your voltages may vary some from this but look for at least 12 volts not running and then an increase while running..if all that checks out then you at least know that you have the voltage available then you can start checking as described above
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Old 08-19-2013, 03:44 PM   #4
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Join Date: Feb 2013
Location: Almost a PINEY...
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I had the exact same issue, and odd as this may sound, I disconnected the O2 sensor and the condition cleared up, still haven't replaced it yet either. Milage didn't drop, power, if you can call it that, stayed the same too...
Patience and perseverance have a magical affect before which difficulties disappear and obstacles vanish.

John Quincy Adams
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Old 08-19-2013, 04:54 PM   #5
tmaxx19841's Avatar
Join Date: Jun 2012
Location: naples
Posts: 28
ok I just disconnected the o2 sensor I got to borrow a volt meter this week
thanks for the help ill let you all know what I find
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