dome light wiring help 101. - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 10-24-2005
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dome light wiring help 101.

well since my cab cage, I've done away with my Dome light and it sucks big time, I went to walmart and bought this little 3 light led that plugs into my cig. lighter, well I dont want it plugged in there I want to wire it up to my stock dome light wire, I have two there a green with orange stire and one that appers to be all black, could be because I spray painted everying, but I tried to test them to see what one had power and what one was ground I've had no luck any help would be greatly appriated.
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Old 10-24-2005
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From Griggs cardomain....

3A. Green/Orange(GN/OR) - Map light power
3B. Black/Blue(BK/BL) - Dome light power

hope this helps some.
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Old 10-24-2005
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Quote:
Originally Posted by PickupMan92
From Griggs cardomain....

3A. Green/Orange(GN/OR) - Map light power
3B. Black/Blue(BK/BL) - Dome light power

hope this helps some.
so they both are power, I just need to tap into dome light and then ground it out? hrm I'll go test it out hopefully my fuse isn't blown...
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Old 10-25-2005
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Map light is "constant" but may be behind a battery saver, (doubt it though), dome light is accessory on only. Battery saver should be a function of the PCM that switches off after no key/ignition on for like 10 minutes or so but I can't say if that's a 2000 feature or not.
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Old 10-25-2005
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Yes, the 2000 has a Battery Saver and it is for both the map light and the dome light circuits.

The map light wire (LG/OR) is hot always until the GEM times out the Battery Saver about 10 minutes after key off.

The dome light wire (BK/LB) is hot whenever any door switch grounds and tells the GEM to activate the Interior Lamp Relay. It is also hot when the dimming module is rolled to its extreme. In both cases, the Battery Saver Feature will turn off power about 10 minutes after the key is turned off.

Ground is not wired in the OEM arrangement. It is provided by a mounting screw from the dome light assembly into the roof structure.
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Old 10-25-2005
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thanks for the break down bob.
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Old 10-25-2005
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well as I understand it I can touch my volt meter to either the g/o wire or the blk/blu wire and then ground the negitive of the meter and it should tell me the volts, but I have no power going to either of those wires, my fuse isn't blown, where do those wires come from I can't seem to figure it out for the life of me.
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Old 10-25-2005
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Quote:
Originally Posted by flomaster
well as I understand it I can touch my volt meter to either the g/o wire or the blk/blu wire and then ground the negitive of the meter and it should tell me the volts, but I have no power going to either of those wires, my fuse isn't blown, where do those wires come from I can't seem to figure it out for the life of me.
Both wires are fed through fuse 26 in the dash fuse panel.

Be sure to close and open your door to reset the battery saver timer. Both circuits go dead after 10 minutes with the key off.
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Old 10-25-2005
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Quote:
Originally Posted by rwenzing
Both wires are fed through fuse 26 in the dash fuse panel.

Be sure to close and open your door to reset the battery saver timer. Both circuits go dead after 10 minutes with the key off.
yeah I've tried that, fuse 26 is just fine, I found the relay on the passenger side which looks like it controlls that it was getting power to it, yet I can't trace where the wires on the roof actually come from. I may have to run another wire, but I'm not sure where exactly i need to tap in to.
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Old 10-25-2005
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Both the map light and dome wires pass through the C201, which is a flat 14-pin connector located "behind the LH side of the instrument panel", according to Ford's book. The 2000 is wired a bit differently from mine so I only have the schematics to go by.

It's very difficult to tell from the picture but it looks like the 00 harness is routed from the left end of the dash, along the driver side sill to the rear of the cab, then up to the roof and forward to the dome light assembly.

On my 03 truck, the routing is under the carpet on the left side of the transmission tunnel, then under the driver seat, then to the driver side rear pillar and up to the roof by the CHMSL and forward to the dome light. You might look there, too.

Last edited by V8 Level II; 10-25-2005 at 07:05 PM.
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Old 10-25-2005
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bob, found out what my problem was, there is a plug that plugs into the wiring harness that runs along the drivers side of the trans tunnel plugs in there and runs up the drivers side B pillar. I plugged it in and now im getting power, both wires are working. can I hook up some LED's to use for my dome light, b/c well I can't put my stock light back up there and it would look kinda goofy. see what I mean..
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Old 10-25-2005
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You can use LEDs provided that they have the correct current limiting resistor in series. Some LEDs intended for automotive applications include a resistor sized for a 12v system but most ordinary LEDs need to have it added. More info here:

http://www.cardomain.com/ride/296394/13
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Old 12-16-2006
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Bamn back from the dead thread.

update well I got a dome light wired up. black/blue wire directly to light and orange/green wire to light switch on light and light is grounded. now my only problem is the dome light doesn't alway come on when the door is open. but the light will always turn on when i push the switch on the light. any suggestions?
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Old 12-16-2006
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Doesn't always come on when you open the door, but sometimes it does?

Maybe a loose connection? bad ground?
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Old 12-16-2006
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Quote:
Originally Posted by Gearhead61
Doesn't always come on when you open the door, but sometimes it does?

Maybe a loose connection? bad ground?
yeah I'll have to recheck that tomorrow when its not 25 deg. outside. and i can actually see what the F*cK im doing might also spray some WD40 in the door latch too.
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Old 12-16-2006
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ok, my blue/black wire leading to the dome light is not getting power. I found a spot under the dash where i could test it and still nothing. oh man can I make my own wire and just run it up there?

anyone have a diagram of where the blue/black wire starts from?
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Old 12-16-2006
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Quote:
Originally Posted by flomaster
ok, my blue/black wire leading to the dome light is not getting power. I found a spot under the dash where i could test it and still nothing. oh man can I make my own wire and just run it up there?

anyone have a diagram of where the blue/black wire starts from?
The blue/black dome light wire is ultimately controlled by the GEM which will time out and turn it off the after a door has been ajar for several minutes. This is the Battery Saver feature. Power to the blue/black is dependent on the correct operation of the Battery Saver Relay and the Interior Lamp Relay, both of which are in the Relay Box under the dash.
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Old 12-16-2006
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so its possibly my relay is bad on that as well. I found out that if I roll my dimmer switch all the way up my it will turn the light on, but if I open the door while the switch is rolled in the up/on position my light turns off. damn electrical is a pain in my *** trying to track down a problem.
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  #19  
Old 12-16-2006
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bob I could kiss you. my problem all along was a faulty relay for my dome light and my hazzard/blinkers replaced both of those and Bam I'm golden. all this headache and fuss trying to track down a broken wire when it was just a simple relay.

so for those with a similar problem check your fuse and relays.
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Old 12-16-2006
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  #21  
Old 10-30-2017
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Where behind the dash exactly is the black/blue wire? I have the radio pulled out but still can't locate this wire. I took the dome light off and see the black/blue wire but I would like to tap it from behind the dash since it's much easier than pulling the headliner to tap into the wire.

thanks,
-Nigel
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