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Old 03-22-2012, 08:48 PM   #11
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Originally Posted by f1100turbo View Post
on newer trucks and his may fall into that category. the trailer stop turn tail fuses are separate from tv. so if theres a short in the tt the tv still works ok .
I most likely was not clear. I was refering to the fuse that guards the trailer plug Left Turn/Left parking light; not the trucks light system.
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Old 03-22-2012, 08:54 PM   #12
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Old 03-22-2012, 09:16 PM   #13
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On the subject of trailer lights: the other night I wanted to check the lights on my TT. I backed the tv up to the tongue, did not connect. I connected the plug for my TT to check my lights, the weidest thing happened when I turned the left turn signal on, the signal was blinking, so was my clearance lights. You can just imagine what went through my mind, what kind of problem is this? I then connected the tv to the TT and everything worked as prescribed. I thought...Ground....truck to trailer. Well at least now I know what happens when you want to short cut things...
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Old 03-23-2012, 03:14 PM   #14
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Thanks for all the replies. The left turn signal is the yellow wire, which is typical for trailer wiring. I have 12V flashing to the end of the yellow wire coming from the plug side, which is not hooked up to anything. The tail lights work. It was getting dark when I was trying to fix it, but on the light itself the tail light wire looked brown and hooked to a brown wire, black ground was hooked to a bundle of green wires, and the red wire which should be the turn signal was hooked to a red wire. There were several red wires in the conduit box under the tongue, but none were unhooked.

I haven't tried a new bulb, but I can see the element inside the bulb and it's not broken. Still, wouldn't hurt to have a spare. I will pick one up.

I also towed a friend's cargo trailer a couple weeks ago, which has the same Truck-Lite type tail lights, and it worked fine with my truck.
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Old 03-23-2012, 03:38 PM   #15
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Originally Posted by tracetrimble View Post
I haven't tried a new bulb, but I can see the element inside the bulb and it's not broken. Still, wouldn't hurt to have a spare. I will pick one up.

I also towed a friend's cargo trailer a couple weeks ago, which has the same Truck-Lite type tail lights, and it worked fine with my truck.
You really can't tell if a bulb or fuse is good by looking at it. A Volt Ohm Meter is the best way to check it.

Based on what you have stated, I think you have a bad bulb or socket. Check for corrosion under the bulb.

Let us know how this finally resolves. The Bargman color code has the yellow connected to the center post and "not used" in most installations.
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Old 04-02-2012, 11:03 AM   #16
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Replaced the bulb with no luck. I can't find my test light, and digital multimeters suck for diagnostics. Will acquire another test light and start chasing wires. I will update this thread when I find the problem.
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Old 04-02-2012, 11:48 AM   #17
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From my new diagram collection

Try out these:
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Old 04-02-2012, 11:55 AM   #18
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Awesome, thank you!
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Old 04-02-2012, 11:58 AM   #19
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Just refer to our local "HERKBRARY" for any diagrams, charts, articles and instruction books. Thanks Lou! Your post have helped all of us at one time or another.
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Old 04-02-2012, 11:59 AM   #20
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I got rid of that color one. That looked like it was specific to a brand of trailer. The other one looked correct to me.
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