General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

OHC Map light no functioning

Old Oct 20, 2006
  #1  
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OHC Map light no functioning

i spent 5 hrs today installing the OHC today, about 2 of those hours trying to get the map lights to work. I did exactly what the instructions said, the bulbs where blackened but the filliment was not damage, but i replaced them after an 1 hr of fgihting, but still not working....can anyone help me?
 
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Old Oct 20, 2006
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Where did you tie them in at? As far as I know, you're lacking the wires in your dome light area to tie the map lights into on an '05.
 
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Old Oct 20, 2006
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You have to tap into different wiring for 04+, Bob will chime in I am sure. I had the same issue on mine. You have to run another wire down to the SJB.
 
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Old Oct 20, 2006
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i wired it right, i had to wiring into the speed sensor wire behind the gauge cluster, i teid into the dome light for the OHC, and to the dimmer
 
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Old Oct 20, 2006
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the temperature and direction comes up on the display, and it dims when i turn on the headlight, and dim the dash lights
 
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Old Oct 20, 2006
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Let me ask again, and give me colors and locations: how did you wire it? What wire did you tap for the map lights? To keep saying "you wired it right" isn't going to help us diagnose your problem: either you did wire it wrong, or your OHC is broken. One we can assist with and the other we can't.
 
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Old Oct 20, 2006
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And i check for power coming to the map lights,they are getting power to the harness, so i am wondering something in the console itself is fried
 
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Old Oct 20, 2006
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I used your diagram, and the special 04+ wiriing on it, but i couldnt find the gry/blck wire in the smart junction box, someone told me last resort is behing the instrument cluster and it was
 
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Old Oct 20, 2006
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The gray/black wire is NOT the map light wire. In my how to I tell you what each wire is for. Find the color that is supposed to be the map light power and tell us where in your truck you hooked it. The VSS wire doesn't affect the map lights.
 
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Old Oct 20, 2006
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Only 1 wire (blck/blue) its tired to the dome light
 
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Old Oct 20, 2006
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i know...just saying, it's the only location for the vss on my truck
 
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Old Oct 20, 2006
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and the green/orange is tied to the dimmer module
 
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Old Oct 20, 2006
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so maybe green/orange is different for my truck to?
 
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Old Oct 20, 2006
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looks sweet though...thankx for the how-to
 
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Old Oct 20, 2006
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No problem and you're welcome -- I love mine as well, lol.

You've now posted the necessary info for someone with later truck prints to help you now. My guess is: the green/orange is not tied in to the right spot. The dimmer module isn't supposed to control that. The dimmer only has power with the key on, and generally the map lights are supposed to have "always on" power supplied.

I don't remember offhand where Bob put it, but it needs "full time" power and it should be on an appropriately fused feed.
 
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Old Oct 20, 2006
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I do not want to tackle your EATC install though, if i had this much trouble, i'd prolly hang myself after trying it.LOL
 
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Old Oct 20, 2006
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where did you tie it in at?
 
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Old Oct 20, 2006
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Well, in my 2002, the dome light area has an "unused" wire in it for map lights. In 2001-2003 Rangers one can simply bolt in a different dome light and have map lights. There is an actual grn/orn wire in the roof that the OHC can use and it makes it easier.

In 2004 apparently the wiring harness was very revised and even some color codes changed. Bob (rwenzing) is the expert on newer Rangers pretty much. Although a mechanical engineer by training, he's analytical and precise and has refined his electrical knowledge to where it rivals mine I think, lol. Hopefully he'll help you find the right place to put your wire.
 
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Old Oct 20, 2006
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thankx alot, i very much appreciate it.
 
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Old Oct 20, 2006
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if i hooked up the gree/orange to the dome light, would i be able to test the maps?
 
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Old Oct 20, 2006
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I also found a a website with pdf's on owner manuals for explorer's, just to now how to recalibrate the ohc, here's the link
http://www.analogstereo.com/ford_exp...ers_manual.htm
 
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Old Oct 20, 2006
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Did you make sure it's hooked up to a good solid ground?
 
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Old Oct 21, 2006
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For 2004+, the console's map light wire (LG/OG) should be connected to the Ranger's LG/OR which is the "Battery Saver" circuit. The LG/OG for 2004+ starts at the gray connector of the Smart Junction Box and ends at the dimming module. You can tap it at either end.

The Battery Saver circuit is hot when the key is on and remains hot for a few minutes after the key is turned off. If you tried the map lights after the BS had timed out, they wouldn't have worked. Using the BS wire could save you from a dead battery if you left the map lights on accidentally.

You could also connect the console's LG/OG to a fused constant hot. That should work fine but you would lose the Battery Saver benefit.
 
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Old Oct 21, 2006
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Originally Posted by 05ranger
if i hooked up the gree/orange to the dome light, would i be able to test the maps?
As a temporary test, yes. Since the map lights should light up as dome lights when the map lights are off, if you hooked it up that way and opened the door, the lights should stay on whichever way the switch is engaged. Basically, hook it up that way, and the light should be on.

Right now, when the map light switch is in the correct position, the lights should light as dome lights. Is that happening now?
 
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Old Oct 21, 2006
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they haven't worked yet, so i will hooked green/orange to dome for testing, i hooked ground to screw on mounting plate, can't get any more of a solid ground than that
 
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