RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login

Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 03-25-2019, 08:37 PM   #1
Junior Member
 
National RV Owners Club
Join Date: Oct 2015
Posts: 19
Tow Plug Wiring

2000 Tradewinds, Freightliner Chasis


I feel like an idiot -- silly me, I expected my factory wired plug to "just work", what could be simpler, plug in and go, right?!?
I purchased a tow dolly from Craig's List, supposed to pick it up later this week 1/2 way to Florida from home. Seller emailed me the connection specs, I purchased a 6 to 4 adapter and a drop hitch from Amazon that arrived this afternoon. For grins and chuckles, thought I should test the pins on the flat-4...
Long story short, going back to the factory 6, I have no 12v power on any pin. 5 are wired, 4 of the 5 short to ground (beep my meter).
Are there a separate fuses for the tow connector or do they share the same wire/fuse as the lights? If there is a separate, how might they be labeled? I have the National distribution center diagram - nothing jumps out at me. Also the Freightliner fuse box below the drivers seat - it shows tail lights, signals, etc but nothing obvious for towing.
Any direction is most appreciated.


mg
__________________

mgambalie is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-25-2019, 08:44 PM   #2
Senior Member
 
Join Date: Jun 2017
Posts: 1,399
Don't use a continuity tester (ohmmeter), use a voltmeter to test when the appropriate light is on.
__________________

tfryman is offline   Reply With Quote
Old 03-25-2019, 08:53 PM   #3
Junior Member
 
National RV Owners Club
Join Date: Oct 2015
Posts: 19
I used the volt meter first, got zip, then tried continuity from each pin to ground.
mg
mgambalie is offline   Reply With Quote
Old 03-25-2019, 09:01 PM   #4
Junior Member
 
National RV Owners Club
Join Date: Oct 2015
Posts: 19
Inspecting the fuse/wiring box up front again, there are 2 more banks of fuses that are not identified. Does Freightliner post a diagram or chart? I searched google and their website, perhaps I am not using the proper terms.
mgambalie is offline   Reply With Quote
Old 03-26-2019, 10:42 AM   #5
Junior Member
 
National RV Owners Club
Join Date: Oct 2015
Posts: 19
I was able to locate the Freightliner fuse diagrams. For future reference, https://www.rvtechlibrary.com/ is a huge resource of manuals for multiple systems and chassis.


The first part of my issue is corrosion, inside the wiring plugs. There is a 7-pin weatherproof connector from the chassis wiring harness that feeds 2 6-pin Molex connectors, one for the tow plug and the other for rear lights, so at least the lighting circuits are common - not fused separately. Since the same connector was feeding the (working) rear lights, I opened the Molex to the tow connector, sprayed with WD-40, opened and closed it a couple of times to clean the pins, and I now have power at the tow plug.
I don't have ground.
Not even at the 7-pin. The wiring behind that goes through the frame into the engine compartment -- I figure its going to take some time to hunt it down -- so I installed a temporary ground wire directly to the tow plug; I hope that will suffice for the next couple of weeks.
mgambalie is offline   Reply With Quote
Old 03-26-2019, 02:26 PM   #6
Senior Member
 
Join Date: May 2017
Posts: 422
Does anyone know if the 7 wire RV plug is wired the same as the 7 wire plugs on other than RV's (SUVs, pickup, big trucks)?

One would certainly think so but I have my doubts.
__________________
2018 Nexus Ghost
WorldCat25 is offline   Reply With Quote
Old 03-26-2019, 03:57 PM   #7
Senior Member
 
Join Date: Jan 2016
Posts: 151
Quote:
Originally Posted by WorldCat25 View Post
Does anyone know if the 7 wire RV plug is wired the same as the 7 wire plugs on other than RV's (SUVs, pickup, big trucks)?

One would certainly think so but I have my doubts.
It should be.

I had a similar issue with mine when I bought ir. It had never been used for towing, the socket on the back of the motorhome was just full of corrosion, it had traveled up the wires a couple of feet.

I had to cut the wires back to clean copper and re-wire (solder and heat-shrink the joints). I just followed pictures online for the colour codes, checking with a volt-meter as I went. Amazingly it all worked.

Steve
__________________
2014 Forest River Sunseeker 2650CDS
2015 Jeep JK Sahara
stevemoores is offline   Reply With Quote
Old 03-30-2019, 12:50 AM   #8
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 671
Better is a 6-pin/ 7-pin TESTER that just plugs in, check Amazon (under $10)
__________________
99-GS Conquest Limited 6266 Class-C
THenne1713 is offline   Reply With Quote
Old 03-30-2019, 12:52 AM   #9
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 671
I did a google search, believe etrailer.com shows a variety of plug options/ variances
__________________
99-GS Conquest Limited 6266 Class-C
THenne1713 is offline   Reply With Quote
Old 03-30-2019, 05:16 AM   #10
Registered User
 
Join Date: Apr 2018
Posts: 1,253
Quote:
Originally Posted by THenne1713 View Post
Better is a 6-pin/ 7-pin TESTER that just plugs in, check Amazon (under $10)

Well maybe. But say you have a bad ground on the TV. You plug your fancy little tester, the ground is good enough, to carry all the currant needed to light the little pity LEDs. You plug in your trailer, and things don't work. Now you spend the next 3 days pulling your hair, and cobbling up the wiring of the trailer before you call somebody that knows what they are doing. Took me 1 minute to find the original problem, 10 minutes to fix. Hours on the trailer...
__________________

ScoobyDoo is offline   Reply With Quote
Reply

Tags
tow, wiring



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wiring in tow vehicle plug Johnontheroad Monaco Owner's Forum 8 07-16-2013 11:56 AM
7 pin plug to 4 pin plug on tow LSepulveda iRV2.com General Discussion 6 09-14-2012 07:16 PM
Motorhome Tow Plug Wiring Question Megsfolks MH-General Discussions & Problems 10 06-15-2008 02:40 AM
Spartan Chassis plug in "diagonistic" plug David K Winnebago Industries Owner's Forum 24 12-21-2007 04:44 AM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:58 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.