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Trailer Wiring

Tomarob

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City, State
Trenton, NJ
Year, Model & Trim Level
1999 Explorer Sport
OK, - - just recently purchased a 1999 Ford Explorer (Sport), - - and need to be able to pull a trailer once in a while. So, after checking around (mostly here, thanks), I was able to determine all I needed to do was hook up an '8-pin round' to '4-pin flat' adapter-cable to the capped jack located behind and just underneath the back driver's side taillight area. I then, after testing for power, plugged my trailer jack into this new hookup , and all seemed fine, my trailer lights all worked as they should. So, I then unplugged the trailer, and re-parked the Explorer back in my driveway. Only thing was, then, even though the trailer was unhooked and my dashboard headlight switch was 'off', both the headlights and the tail-lights stayed on. (Note: Autolamp was set to 'Off'). Anywayz, I then realized I could only turn the lights back off by lowering the dashboard-light dimmer control to the 'Off' position. Is this normal?? TIA
 
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koda2000

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No. Not normal. Sorry, but I have no idea what would cause your issue.
 
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974X4BLACKSPORT

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BLACK 1997 SPORT 4 BY 4
You unplugged the trailer, but was the trailer wiring unplugged from the connection port in the rear of the Exp.?
 
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Tomarob

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1999 Explorer Sport
You unplugged the trailer, but was the trailer wiring unplugged from the connection port in the rear of the Exp.?
No, - - but I wouldn't think it would be normal to have to unplug that every time, would it ??
 
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Tomarob

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1999 Explorer Sport
It shouldn't, but it would be worth trying for diagnosis sake.
Probably should have stated to begin with, - - if I do unplug the new (port) connection, - - the truck lights all work as normal again. And although it didn't seem right to me, but yet I knew turning the dimmer switch to 'off' kind of cured the problem, I just went ahead and re-hooked the port connection, and left the dimmer switch off. Next morning, - - no dead battery or anything, all is fine.
 
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Tomarob

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1999 Explorer Sport
OK, it rained most of the day yesterday around here, so I finally got back out there today. Meantime, don't know if I was correct or not, but my suspicion was that a relay was 'sticking' in the closed position, and that maybe if I just banged on it a bit, it would release?? And then maybe just turn it on and off a few times, to get it 'operational' again?? (I suspect it's never been used). Somewhere in my readings, it seemed the relay that might of caused this (trailer-park-lamp-relay) was located in the jack-housing area above the back left wheel. So I don't know, but I tapped on the housing boxes back there, then I turned the dimmer switch back on, and then plugged my trailer back in to the vehicle trailer-jack, then turned the vehicle lights on, checked all the vehicle and trailer lights (all good), and then turned the lights back off, and - - VOILA!! Now everything turns off as it should. Tried several times more, all good. So, - - all in all, - - not sure if I figured it out, or just got lucky, - - but so far so good.
 
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