4x4 and Dome Light electrical issues


Dowaine

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1998 & 1989
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Ford ranger
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I bought a 1998, 4x4, 5 speed ranger a couple of months ago and the 4x4 is intermittent, it'll work for a few seconds if I disconnect and reconnect the battery, and it will randomly start working as I'm driving down the road, it is linked to the dome light somehow because whenever it works the dome light works and when it quits so does the dome light, any and all help is appreciated
 


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RonD

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1994
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In 1998 to 2000 Rangers the GEM(generic electronic module) controls the 4x4 and dome light(when opening the door), also sets speedometer speed in these 3 years

The dimmer wheel should also turn on the dome light via a different circuit so try that to see if it works

The GEM is the Body Computer, it controls wiper/washer, power locks and windows, "door ajar light", dome light and 4x4 system
It is located behind the Radio in the dash

Do the 4WD lights ever Flash when you select 4high or 2WD?
 

Dowaine

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the dimmer switch doesn't turn it on, i also checked all the fuses

the 4x4 never flashes it either works or doesn't, now sometimes the windshield wipers don't work but that seems to be separate from the problem as they will work when the 4x4/dome light wont

i did pull the gem and split the clamshell but i didnt see any obvious signs of failure
 

RonD

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There is a relay box above gas pedal area, has flasher and a few other relays, and the interior light relay

The power from fuse 26 goes thru this relay
When relay is OPEN(off) the dimmer wheel can send dome light power thru the relay
When GEM activates this relay, closed(on), then power passes to dome light

Maybe relay is the issue

Other than the GEM there is no other connection between dome light and 4WD system

As mentioned above (turn signal)Flasher is in the Relay Box, maybe be a problem with that box

This is not labelled 1998 Relay box layout but might be: https://www.2carpros.com/images/question_images/222593/original.jpg
 


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