2000 WJ Limited no passenger side headlights, low voltage - JeepForum.com
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post #1 of 4 Old 11-14-2019, 09:22 PM Thread Starter
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2000 WJ 
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Location: Oregon
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2000 WJ Limited no passenger side headlights, low voltage

Hoping the gurus and collective wisdom of this forum can help me DiY repair another WJ problem...

2000 WJ Limited, stock headlights/bulbs. Passenger side headlight not working on low or high beam. Turn signal and parking lights work on passenger side. Everything works on driver side. Swapped bulbs and thought I got passenger side lights on, yet I think they were just dim.

Pulled all four bulbs (driver = D and passenger = P, low beam = LB and high beam = HB) and did a voltage check (with engine off) with results below:

---- ----- ---- ----- --------------------------------------------------------------------------------------------------------------------
Headlights off 0.0 0.0 0.0 0.0 Makes sense, zero volts at all 4 light sockets when headlights are off
Low beams on 11.8 0.0 9.6 0.0 High beams zero volt makes sense, driver low beam near 12V, however passenger low bean at only 9.6V
High beams on 11.8 11.8 9.6 9.6 Driver side has 12V to both high and low beam; passenger side has 9.6V to both high and low beam

So what could be causing a voltage drop to my passenger side bulbs, apparently just enough that the bulbs won't light up? Bad ground?

Is there a list of voltage/continuity checks I can do on the passenger side headlight harness to diagnose the problem?
Does anyone have a headlamp wiring diagram handy?

Thanks in advance all!

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post #2 of 4 Old 11-14-2019, 11:03 PM
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2000 XJ Cherokee 
Join Date: Aug 2017
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the haynes books cover electrical very well. never failed me. run to autozone..

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #3 of 4 Old 11-18-2019, 03:36 PM Thread Starter
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2000 WJ 
Join Date: Dec 2008
Location: Oregon
Posts: 56
Short of buying a Haynes manual, is there any other collective knowledge/experience lurking on this forum to cure low voltage to headlights?
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post #4 of 4 Old 11-20-2019, 07:14 PM Thread Starter
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2000 WJ 
Join Date: Dec 2008
Location: Oregon
Posts: 56
Bump...with more info. Did some more probing around with my voltmeter on the passenger headlight...

With lights off I measure 0 V on both connectors...makes sense.

With lights on low beam, I measured 7.8 V on low beam connectors and 3.4 V on highbeam connectors. Previously I measured 0 V on high beam connectors when switch was on low beams...

With lights on high beam, I measured 7.6 V on both low beam and high beam connectors.

Last thing I noticed...when I wiggle the connector for high beam bulb, the parking lights/turn signal flicker on the passenger side.

Based on this I am thinking I have a short in the high beam bulb connector. Does the above agree with that? Anyone have a wiring diagram for a WJ headlight? How far does the passenger headlight harness run?
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