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Old 07-24-2011, 10:39 PM   #15
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Quote:
Originally Posted by Inland RV Center, In View Post
The trailer turn signal bulb elements are exactly the same circuit for the brake light. They are one in the same.
My trailer has a separate lead wire for brake lights, left turn, and right turn lights.
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Old 07-25-2011, 09:43 PM   #16
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Originally Posted by Inland RV Center, In
The trailer turn signal bulb elements are exactly the same circuit for the brake light. They are one in the same.
Note: Andy said "the trailer turn signal bulbs"

I'll say it again. Since your TV has turn signals that are separate from the brake light circuit and your trailer uses the brake light filaments in the bulbs for the turn signals. You will not be successful in getting the turn signals and brake lights to work on the trailer with your TV until you get an adapter that you install on the TV and wire it to the 7 pin plug on the TV.
These adapters are available at most auto part stores and they are specifically designed to make your TV look like one that uses the same bulb for turn signals and brake lights.
In a standard brake/turn signal system there are 2 wires; one for left turn and one for right turn. When you hit the brakes both left and right bulbs light up unless you have a turn signal on.
In a system with separate turn signal lights there are 3 wires involved; one for left turn; one for right and one for both brake lights.
Since your trailer has only 2 wires in the brake/turn signal system (left turn = red wire; right turn = brown wire) there is no place for you to connect the 3rd wire. Thus the need for the adapter.
If you were to turn on the emergency flasher in your TV you will see that the turn signals flash and not the brake lights. It is wired that way so that you have flashing lights on both the front and rear of the vehicle.
Just tell the person at the auto parts store that you have a vehicle with separate brake lights and turn signals and you want the little black box that is used for trailers that use the same bulb for signal and brake lights.
In an earlier post I put up a photo of how the 7 pin plug is wired. Note there is not a pin for brake lights only. Just left and right turn because they are the brake lights as well.
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Old 07-25-2011, 09:56 PM   #17
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After a little more discovery, I think I've found the issue. My TV has a tow computer module that is supposed to convert the 3-wire light system to the 2-wire light system automatically -- without the need for this extra adapter. Supposedly there is a known software glitch in these that the dealer can reprogram. I'm hoping that's it. If not, then I will go pick up this convertor/adapter. Stay tuned! And thanks for all the help.
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Old 07-25-2011, 10:11 PM   #18
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www.wiringproducts.com

3-wire to 2-wire Tail Light Converter

$17.50

TLC-74991
Availability: In stock


!



3-wire to 2-wire Tail Light Converter


For cars and trucks with separate bulbs for stop (red) and turn (amber or red) to operate trailer lamps that have one bulb for both stop and turn. Without this converter, only turn signals will operate on the trailer. For 12 volt DC electrical systems only. Maximum load capacity is 3 amps. Self-adhesive backing provided.
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Old 07-27-2011, 11:05 PM   #19
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Brake lights are officially working. My TV's computer that controls the lighting functions was incorrectly coded. A software update did the trick. Thanks for all the advice and assistance. Now I am more knowledgeable about this stuff for future TVs I hook up to the Airstream.
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Old 08-07-2011, 02:54 PM   #20
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Tail lights partially working.

Hello,

This is the problem, my left turn signal, brake, and marker lights work, my right maker, turn signal and running lights work, but no brake light. I checked the brown wire from the trailer plug to the rear bulb housing post, it has continuity ????, and shows it's the correct pin on the TV.

Do I need the adaptor to combine the turn signal and the brake lights ?, this is the only reason I can come up with that it dose not work.

Thanks
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Old 08-07-2011, 08:59 PM   #21
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If your TV uses the same bulbs for turn signal and brake lights you do not need an adapter. Does the right turn signal work on the TV?
Try turning on the emergency flashers and see what works.
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Old 08-08-2011, 06:28 PM   #22
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Sorry for not getting back sooner, I work long hours and only just got home. I won't be able to check it until tomorrow. Everything works on the TV, I did find out that I have a whole separate electrical system for the towing, fuses wires etc. on the truck, so I will check the fuses tomorrow and let you know.

I did get to take the rear light housings off and scrape and wire brush the rust and recoat with what I hope to be a better coating. This was yesterday after checking for continuity, I can't believe AS used Mortite to seal the rear back plate for the light housings. I mean it is a good product and that is what I will use to reseal but I would think there must have been something better back in 63. This marks the start of the restoration.

Thanks and I will keep everyone interested informed.
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Old 08-08-2011, 07:16 PM   #23
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An appropriate tester saves a lot of time, answers important questions, and provides an objective way to wire the trailer and the cord. My system utilizes a 7-way tester. In one minute I can see if my tow vehicle is wired correctly and I can see if everything is working.

My tester fits in the trailer cord plug located behind the LP tanks at the front of the trailer. By back powering the 7 pins I can see if my trailer is wired correctly and I can see if everything is working.
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Old 08-09-2011, 09:19 PM   #24
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Don't doubt that a tester would make life easier, but I don't have one and am new to trailer camping and my new to me 1963 GT, I am sure I will have one in the future.

I worked on the lights until dark, all I can say is everything works except the right rear brake light, checked the TV and all is well. I am now thinking I need one of those two into one adapters, this is the only reason I can come up with that it is not working. I know TG says above that I shouldn't need one but what else could it be. I'll be calling my trailer guy tomorrow and see what he thinks, any other suggestions would be welcomed.

Thanks

Ken
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Old 08-10-2011, 12:20 PM   #25
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Quote:
Originally Posted by njloco View Post
Don't doubt that a tester would make life easier, but I don't have one and am new to trailer camping and my new to me 1963 GT, I am sure I will have one in the future.

I worked on the lights until dark, all I can say is everything works except the right rear brake light, checked the TV and all is well. I am now thinking I need one of those two into one adapters, this is the only reason I can come up with that it is not working. I know TG says above that I shouldn't need one but what else could it be. I'll be calling my trailer guy tomorrow and see what he thinks, any other suggestions would be welcomed.

Thanks

Ken

What is your tow vehicle?
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Old 08-11-2011, 11:12 AM   #26
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Hello adwriter73,

My TV is a 2004.5 GMC Sierra, 2500HD. I am going to take the left and right side wires at the plug and reverse them, then if the right rear brake light works and the left doesn't, at least then I will know it isn't the trailer.

My trailer guy seems to think that a previous owner may have installed an adaptor in the body of the trailer and that is why is doesn't work, I'll know more after I do the above mentioned switch.

Thanks

Ken
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Old 08-17-2011, 08:44 PM   #27
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I wanted to let everyone know that I traced it down to the TV, apparently the previous owner used the right side trailer brake wire for something other than pulling a trailer. The wire going to the plug in the back of the TV is dead, I haven't figured out where it is hooked up as yet, but I know it's not correct.

Thanks for all the help, and thank G-D it's not the trailer.

Ken
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