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Old 08-01-2020, 03:47 PM   #1
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Running /tail lights

I have a 1993 265 eagle. My tail lights and marker lights are not working. I cant find a junction box and all wiring I can see is in good condition. Any help is appreciated.
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Old 08-01-2020, 03:50 PM   #2
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I would check the fuses on the tow vehicle first... Trailer wiring has separate fuses and circuits from tow vehicle. Quick and dirty check the plug on tow vehicle

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Old 08-01-2020, 03:57 PM   #3
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I checked the first. Seems to be a dead short in the trailer somewhere. Kind of at a loss as I cant see any wiring.
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Old 08-01-2020, 04:04 PM   #4
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Pull the rear light assemblies Without anything connected and bulbs all removed use ohm meter and check for the bulb wires to ground. Should be open on both
Could be pinched wire at the rears

Gotta start somewhere
Meter the bulbs should have some continuity thru them

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Old 08-01-2020, 04:08 PM   #5
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Ok I'll start there. Not sure if it makes any difference but turn signals and brake lights work.
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Old 08-01-2020, 04:20 PM   #6
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I'm getting resistance at the tail lights and lots of resistance at the back of the trailer plug. Is there a junction box that you know of ?
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Old 08-01-2020, 04:53 PM   #7
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That means their not shorted to ground which is good
Have you tried a known good bulb
Are they the round base with offset lock pins?

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Old 08-01-2020, 04:58 PM   #8
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Is this a travel trailer or 5th wheel?
5th will have either a junction or wires just connected and wrapped up in king pin... Travel trailer should have a box on frame right behind propane tanks and battery usually. If you find the wires you can check the umbilical card for continuity for the running light. Do a Google search for the pin out. Remember the key and looking at front or rear.

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Old 08-01-2020, 05:02 PM   #9
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It's a 5th wheel. The tail lights are round with the offset pins. I've got the pin layout and light cord is good.
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Old 08-01-2020, 05:09 PM   #10
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So tried a known good bulb?
What about side marker lights and top of the front bubble?
If running are all dead look for the junction box in king pin. Could have corrosion on the connection from umbilical. If you make a wire up you can jumper trailer battery charge line to running lights. Then check at junction box for 12 volts to grnd. Pin 3 to pin 4 each side of the key

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Old 08-01-2020, 05:12 PM   #11
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I'll search for junction box ( or connections). I jumped pins 3 and 4 once and it burnt out fuse on my truck.
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Old 08-01-2020, 05:14 PM   #12
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Wrong end trailer end.
You have seen the trailers at cpgrd with running lights lite up and no tow vehicle connected
That's what they do on trailer end not with tow vehicle connected

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Old 08-01-2020, 05:15 PM   #13
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��gotcha
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Old 08-01-2020, 05:26 PM   #14
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Couple spade connectors and short piece of wire with a 15 amp fuse just in case of dead short.
You can test turn/ brake lights as well. Just different pins
pin 5 is left turn and stop... Pin 6 is right turn and stop. jumper from 12 volt on pin 4.

If it's not a problem in junction with embilical to trailer wiring could be the embilical plug is getting sloppy in the plug on trailer side

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Old 08-01-2020, 05:30 PM   #15
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Ok. Turn and brake lights work great.
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Old 08-01-2020, 05:34 PM   #16
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Ok
So looked in king pin for the junction box or the bundle connection.
Is your 7 pin a molded or can you pull it apart? Some just have a set screw in the key on plug

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Old 08-03-2020, 06:26 AM   #17
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I got it all sorted. Was a dead short somewhere between the plug and first clearance light in the string. I ran a new wire and everything works great. Thank you very much for your assistance, I appreciate it.

Clayton
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Old 08-03-2020, 06:59 AM   #18
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No problem!

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