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Old 06-19-2015, 09:23 PM   #1
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Wiring problem at rear hitch plug.

Connected the toad tow lights to our new (to us) motorhome at the rear hitch plug. Toad plug is a flat 4 pin and the motorhome is a round with 6 outside flat pins with 8 wires leading into the plug. I am getting right turn signal and right tail light but no left turn signal or taillight. I checked all 6 of the flat pins on the motorhome plug with a test light and I am only getting power for the right turn signal and brake light on one of the pins. All of the other pins have no power when I check for left turn signal or brakes. Any ideas as to what the problem could be?
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Old 06-19-2015, 10:35 PM   #2
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Is there a center terminal in the plug ? Sounds like a Bargman 7 pin , kind of the industry standard , but with 8 wires running in.

Maybe this site will help identify things , but there is always the possibility it's wiring isn't correct.

http://www.etrailer.com/faq-wiring.aspx


EDIT: and of course they changed the web site. I'll be back.
Re-edit should be ok now , look for your plug, and check the wiring according to the diagrams.
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Old 06-20-2015, 04:00 PM   #3
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My plug actually has a Chrysler symbol on it. Thanks for the website link, I'll take a look and see.
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Old 06-20-2015, 04:04 PM   #4
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On the website, mine is the 7 way RV/Standard, but I have no power to anything other than the right turn signal/stop. All of the lights work on the motorhome, so I must have a problem somewhere upstream of the plug.
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Old 06-20-2015, 06:06 PM   #5
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A lot of the Class A's, especially those on a Freightliner chassis, have fuses for the left and right signals.
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Old 06-20-2015, 06:14 PM   #6
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The tail lights are usually fed by the same wire from the plug. IF both the tail light and turn signal are out on one side I would be checking the ground return on that side. It's a fairly common problem. Also pull the bulbs and put them back to clean the contacts. Another common problem. ;-)
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Old 06-20-2015, 06:14 PM   #7
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I had a similar problem with my Trave Supreme. The Spartan Chassis dealer installed a module that sorts out the problem and makes it all work for a flat four pin. Before you tackle a rewire of your coach make inquiries at a RV or truck dealership the solution may be an easy fix.
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Old 06-20-2015, 07:03 PM   #8
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Quote:
Originally Posted by Stump Jumper View Post
My plug actually has a Chrysler symbol on it. Thanks for the website link, I'll take a look and see.
I don't think that Thor , would buy anything from Chrysler so the plug has been replaced . I'd say to open the plug up , there are set screws in the side; you may have to dismount the plug with the 4 corner mount screws, and check the wires.
I don't know the Thor line up too well , is the coach on a Freightliner or Spartan chassis. There may be a fuse box in a rear compartment with fuses dedicated to the trailer plug, that's why the rear light on the coach work and no power to the plug.
These pictures are from a Spartan chassis RV , the cover with the two white tags has to be removed to show the fuses inside. Owner found the fuse box in his engine bay after 3 years of ownership.
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Old 06-20-2015, 07:48 PM   #9
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Update:
Checked all the fuses that I could find and did not find any blown fuses for the turn signals or a fuse for the rear plug. Checked the wires coming into the plug in order to isolate the plug. No power. Starting tracing the wire bundle from the plug towards the front of the motorhome to check for fuses, a broken wire, etc. Lost track of the plug wires in a giant bundle of wires about 10' from the rear of the motorhome. At that point, I decided to take the easy way out and located the yellow wire that fed directly to the left tail light. Spliced a wire from the tail light to the yellow wire on the back of the plug. Viola, problem solved. Thanks for all the advice and help everyone. This site is the best!
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Old 06-20-2015, 07:57 PM   #10
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I have repeater relays for my toad plug located below the battery control center.
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Old 06-21-2015, 08:00 AM   #11
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Quote:
Originally Posted by Stump Jumper View Post
Update:
At that point, I decided to take the easy way out and located the yellow wire that fed directly to the left tail light. Spliced a wire from the tail light to the yellow wire on the back of the plug. Viola, problem solved. Thanks for all the advice and help everyone. This site is the best!
I would consider this a Temporary fix. Leaving it this way opens the door to blowing the fuse and losing THE COACH SIDE ALSO. There is an increased chance when towing that something will short. That is the reason most of the coach builders use relays and separate fuses to isolate the trailer connector.

Now you have a little time to locate the problem and fix it correctly

Update: i just reread your orig. Post. Your fix does not jive with the orig. Problem description. You said you could only measure power on one pin for the right brake light.
That means two other pins are missing power (left turn and tail). Remember, the tail light circuit is common to both sides. This involves two bad circuits at the plug.

Later you said right turn AND TAIL lights worked. Not possible if you really had only one live pin on the coach.




Regards,
Dan
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Old 06-21-2015, 08:53 PM   #12
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Dan,

Originally, I had right turn signal, right brake light and parking light on the same pin. I did not have anything else. Now I have right turn signal, right brake light and right parking light on that same pin and left turn signal, left brake light and left parking light on the opposite pin. The turn signal, brake light and parking light for the left and right side work independently off of only those two pins.
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Old 06-21-2015, 09:27 PM   #13
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Hi Stumpjumper,

First, let's make sure we are talking about the same kind of connector.
Here is a picture of a 7-way connector. http://www.etrailer.com/Merchant2/gr...u40277_800.jpg

It has 6 flat pins and one round center pin. Is This what you have?
It makes no sense to have more wires than pins, unless someone did a poor job of installing.

Now for the connections, on the coach, you need 4 pins minimum.
Right brake/turn
Left brake/turn
Tail lights
Ground

The other pins are elec. Brake control, backup lights, 12v charge line. You can ignore these.
So your last post says you now have two active pins on the trailer plug.
Yet you say you have three separate circuits that are working....this sounds strange.
I am guessing that only the brake/turn filaments are working, but somehow they are also getting energized when you activate tail lights.

Hope you understand that there are two filaments in the light bulb.....

Have you confirmed that tail lights are dimmer than turn signals?
Turn on tail lights with toad connected and also turn on right signal. Can you tell the difference in brightness?

Sorry, but several things are not adding up. I am concerned when hook up for a trip, the lights will not be correct.

Regards

Dan
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Old 06-21-2015, 09:33 PM   #14
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Yep, the 7 pin on left is the one that I have. However, it has 8 wires going into it from the coach. The green wire worked and flashed with the turn signal, bright light with the brakes were pressed and dimmer light with the parking lights. Once the yellow was spliced in, it now works the same.
There are no other hot wires to the plug.
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