Sep 21, 2015, 03:49 PM
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XJ Ask the Question Thread
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Electrical question:
My LED light bar came with an On/Off switch that illuminates when on. I want to replace it with my OEM fog light switch which operates the same way.
(Don't worry about the relays and such; I'm using a separate harness instead of the OEM fog light wiring. I just want to use the switch.)
The setup works with the included switch. It doesn't work with the fog light switch.
Both have ground on top (A), constant in the middle (B), and switched on the bottom (C).
The included switch doesn't have continuity between any poles when flipped to the Off position. When on, it has no resistance between B and C.
The fog light switch has 48 ohms resistance between A and C in the off position. When flipped On, it has 48 ohms resistance between A and B and also between A and C. No resistance between B and C in the On position.
What's with the 48 ohms, and why doesn't the OEM fog light switch work for me?
My LED light bar came with an On/Off switch that illuminates when on. I want to replace it with my OEM fog light switch which operates the same way.
(Don't worry about the relays and such; I'm using a separate harness instead of the OEM fog light wiring. I just want to use the switch.)
The setup works with the included switch. It doesn't work with the fog light switch.
Both have ground on top (A), constant in the middle (B), and switched on the bottom (C).
The included switch doesn't have continuity between any poles when flipped to the Off position. When on, it has no resistance between B and C.
The fog light switch has 48 ohms resistance between A and C in the off position. When flipped On, it has 48 ohms resistance between A and B and also between A and C. No resistance between B and C in the On position.
What's with the 48 ohms, and why doesn't the OEM fog light switch work for me?
Sounds like your fog light switch is 12V C, ground A, and load on B, with two bulbs in series.
CF Veteran
Joined: Oct 2012
Posts: 2,314
Likes: 3
From: Canton, GA
Year: 1996
Model: Cherokee
Engine: 4.0
So, update from the other day... the fluid helped a lot with quicker shifts. I did notice that the shifting between P/R/D seems to have gotten a bit more jarring, and unfortunately the "slipping" or whatever was going on didn't stop... so I guess the next step is to test the TPS and then possibly replace it? If I do end up needing to do so, is the Duralast TPS fine or should I stick with the Mopar one?
CF Veteran
Joined: Aug 2010
Posts: 1,085
Likes: 3
From: Fountain Inn, SC
Year: 1988
Model: Comanche (MJ)
Engine: I6 4.0L
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Means your XJ is like the rest of them. Lol
Sometimes the bulb goes, sometimes the wiring is chewed by rodents, sometimes the contacts in the plug are corroded.
Sometimes the bulb goes, sometimes the wiring is chewed by rodents, sometimes the contacts in the plug are corroded.
CF Veteran
Joined: Oct 2009
Posts: 2,867
Likes: 16
From: Fauquier County, Virginia
Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
This. I replaced the bulb, cleaned the connectors, and finally cleaned the 'button end' switch that pushes in with 4x4 to illuminate the light. I said 'f it' and will be making my own circuit/switch/light that bypasses all the dash hook-up and CAD bullcrap.
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Is there a way I can still make it work, or do I need to use a different switch?
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Did you wire it like I guessed?
Last edited by salad; Nov 25, 2013 at 06:09 PM.
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
I was gonna mess with it when I got to work, but the Bruins game takes precedence. I might go out to the parking lot during the first intermission, but I may also end up waiting til tomorrow due to the outside temps (around -6°C and windy).
I'll post up what I find if I get out there tonight.
CF Veteran
Joined: Sep 2010
Posts: 12,692
Likes: 6
From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Could be that the light just doesn't work
I was gonna mess with it when I got to work, but the Bruins game takes precedence. I might go out to the parking lot during the first intermission, but I may also end up waiting til tomorrow due to the outside temps (around -6°C and windy).
I'll post up what I find if I get out there tonight.
I was gonna mess with it when I got to work, but the Bruins game takes precedence. I might go out to the parking lot during the first intermission, but I may also end up waiting til tomorrow due to the outside temps (around -6°C and windy).
I'll post up what I find if I get out there tonight.
