1999 Fld120
I was standing beside my truck, it was turned off. The trailer lights just turned on.
I had been parked a couple hours. I haven't noticed the before.
I checked my wiring connections from trailer to main panel. My brown and black circuits are live. Also my dash lights stay on.
No other truck lights come on unless I turn the switch on for them. All turn signals and brake lights work normal.
I pulled the relay and the trailer circuits stay on.
The relay buzzes when I put it in, I tried with a different relay, same result. Trailer and dash lights stay on with this relay removed.
I'll try any suggestions in the morning.
Thanks for any help.
Light/electric problem
Discussion in 'Freightliner Forum' started by xsetra, Feb 7, 2021.
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My guess is you’re problems right there. Looks like someone has already replaced the 7 wire to pigtail. I only see 6. Almost looks like the brown is jammed behind the white. It’s hard to tell. I’d try disconnecting each one, starting with the brown wire. I can’t really tell which wire is what color. But one of those is probably shorting out. Maybe they just crimped new ends on, could be bad crimp, or a broken wire in the run somewhere. New 7 wire from fuse panel to pigtail receptacle should fix it. I’d still disconnect them first. See what happens, wires broken somewhere, may be 2 wires touching in the run. New 7 wire can be bought by the foot at any trailer supply.
Last edited: Feb 7, 2021
xsetra Thanks this. -
The trailer wire was replaced couple years ago. The old wire wasn't pulled out. It's pushed to the bottom of box.
I did disconnect the trailer feed. The trailer side and rear marker lights (brown and black) lugs are live even with the light switch turned off. -
Wouldn't hurt to check switch in the dash to make sure its not shorting out
xsetra Thanks this. -
Sounds like you've got a power wire shorted to your trailer lights.
I would start by pulling the fuses for the affected lights and see how the lights respond. If they stay on, you've got a short to 12 volt somewhere.
Could also pull fuses out one at a time and see which circuit is supplying the power. At least that dials you in to where to look closer at.xsetra Thanks this. -
Light switch has 6 poles. 2 bottom control headlights and marker.
2 center my guess power in.
2 upper just marker lights.
I had constant power to both center pins.of harness to switch.
Yesterday I ran thru a lot of rain.
This morning I put everything back the way it was.
All the lights seem to work properly and that relay stopped buzzing. Except if I turn just marker lights on. Trailer lights stay on, when I turn switch off.
If I turn switch up for marker lights and headlights then off, all the lights go off.
I know there's power feeding the system somewhere. I'm in Miami going to Fargo. I hope everything dries out before I get there.
Thanks for the replies.Last edited: Feb 8, 2021
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