Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-04-2021, 02:39 PM   #1
3 Rivet Member
 
1954 22' Safari
Bellefonte , Pennsylvania
Join Date: May 2013
Posts: 155
Images: 1
Can someone clarify the color code for RV Standard Tow Plugs?

I need to replace the tow plug in my 55 Safari and I become more confused the more I look on the net.
I am finding conflicting color code and wire blade positions for the plugs.

I will be installing a 7 blade RV plug but there are conflicting diagrams for the wiring.

The diagram I think is most accurate is like this, for the RV side of the plug:

1 o'clock position - GREEN- for Tail/Running Lights- 14 Gauge
3 o'clock position- RED - for Left Turn/Stop - 14 Gauge
5 o'clock position - WHITE - for Ground - 10 Gauge
7 o'clock position - BLUE - for Electric Brakes - 12 Gauge
9 o'clock position - BROWN- for Right Turn/Stop - 14 Gauge
11 o'clock position - BLACK - for 12V Battery - 10 Gauge
Center position - YELLOW- for Reverse/Accessory - 14 Gauge

But I also have seen conflicting diagrams!

What are the correct connections and color codes for a RV Standard 7 blade plug?
fiftysafari is offline   Reply With Quote
Old 04-04-2021, 02:49 PM   #2
Site Team
 
GCinSC2's Avatar

 
2007 30' Classic S/O
Somewhere , South Carolina
Join Date: Apr 2010
Posts: 5,026
I'd leave the tow vehicle end alone and match the trailer connection to it. This is from Hopkins for wiring.

https://hopkinstowingsolutions.com/s...ng-guides.html

Gary
__________________
S/OS #001
2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712
GCinSC2 is offline   Reply With Quote
Old 04-04-2021, 03:27 PM   #3
Site Team

 
, Minnesota
Join Date: Aug 2003
Posts: 7,686
Images: 59
Old color codes are no longer valid. I agree you should pin-out the trailer wires and match them to the current standard wiring colors.

For example, some old trailers had separate wires for turn signals and brake lights; today those are combined in a single wire. Also early trailers had a separate cable for the 12V power and ground, because some vehicles back then had positive ground polarity.
markdoane is offline   Reply With Quote
Old 04-04-2021, 03:32 PM   #4
3 Rivet Member
 
1954 22' Safari
Bellefonte , Pennsylvania
Join Date: May 2013
Posts: 155
Images: 1
Quote:
Originally Posted by GCinSC2 View Post
I'd leave the tow vehicle end alone and match the trailer connection to it. This is from Hopkins for wiring.

https://hopkinstowingsolutions.com/s...ng-guides.html

Gary
Actually I do not have a tow vehicle at this time.

From that Hopkins diagram, it appears there is a SAE standard and a RV standard with differing configurations
Which standard, SAE or RV standard is the most common.

The Hopkins site indicates the following...
"The 7 blade molded cable utilizes the Auto Industry wiring code. It's prewired and provides protection to the wires with the jacketed wire sleeving. 7 Blade connectors are typically used with large trailers and are the most common vehicle side connectors."

So why is there a special "RV Standard Plug"?
fiftysafari is offline   Reply With Quote
Old 04-04-2021, 03:43 PM   #5
Site Team
 
GCinSC2's Avatar

 
2007 30' Classic S/O
Somewhere , South Carolina
Join Date: Apr 2010
Posts: 5,026
If you go to Airstream.com and look at any late model owners manual it will also have 7 way wiring info.

I’m cooking soon to start eating.
__________________
S/OS #001
2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712
GCinSC2 is offline   Reply With Quote
Old 04-04-2021, 04:01 PM   #6
3 Rivet Member
 
1954 22' Safari
Bellefonte , Pennsylvania
Join Date: May 2013
Posts: 155
Images: 1
Quote:
Originally Posted by markdoane View Post
Old color codes are no longer valid. I agree you should pin-out the trailer wires and match them to the current standard wiring colors.

For example, some old trailers had separate wires for turn signals and brake lights; today those are combined in a single wire. Also early trailers had a separate cable for the 12V power and ground, because some vehicles back then had positive ground polarity.
Since I am rewiring the 1955 Safari I am not locked into an old style configuration.

So by "the current standard wiring colors" are you referring to the SAE J28637 Standard 7-Blade RV Blade Plug wiring?

I have purchased a SAE 7-Blade Plug.

Out of curiosity...were the old Airstreams wired with positive ground polarity?
fiftysafari is offline   Reply With Quote
Old 04-04-2021, 06:20 PM   #7
Site Team

 
, Minnesota
Join Date: Aug 2003
Posts: 7,686
Images: 59
If I was wiring it for a generic tow vehicle, I would use the yellow=left, green=right turn signal configuration. The remaining (blue=brakes, black=12v, white=ground, brown=running lights) are standard. You can use auxilary for back up lights if you have them.
Old airstreams were wired with a separate 12v charging port. It was up to the dealer to check polarity of the tow vehicle and wire the trailer 12v charging cable to match the tow vehicle polarity.
Some older cars (Packards, Dodges, Studebakers, Nash and others) were positive ground polarity until they figured out that it caused excessive corrosion of the wiring.
markdoane is offline   Reply With Quote
Old 04-05-2021, 09:10 AM   #8
Half a Rivet Short
 
2017 30' Classic
Currently Looking...
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 11,985
Hi

Color code on the wires is all over the place. The locations of the blades on the 7 pin connector is what is standardized. What gets weird there is that some diagrams are looking at the back of the truck "socket" and others are looking at the end of the trailer cable "plug".

The only way to make sure it's right is to use a multimeter and see what's hooked where. A close second would be a data sheet from the people who made the cable you have.

Bob
uncle_bob is offline   Reply With Quote
Old 04-05-2021, 09:20 AM   #9
Rivet Master
 
CruizinDux's Avatar
 
2014 20' Flying Cloud
Washington , Missouri
Join Date: Mar 2014
Posts: 2,241
Here is Bob's post #2 from a current thread that I have saved and printed.


https://www.airforums.com/forums/f37...up-216285.html
__________________
WashMoBob
CruizinDux is offline   Reply With Quote
Old 04-08-2021, 08:15 PM   #10
3 Rivet Member
 
1954 22' Safari
Bellefonte , Pennsylvania
Join Date: May 2013
Posts: 155
Images: 1
I received a new 7 Blade RV tow plug for my 55 Safari.
The wiring on the new plug follows the RV Standard color code arrangement.
Although I cannot find a tow/running light wiring diagram for the 1955 Safari, I did find a wiring diagram for a 1963 Airstream.
The RV Standard color code matches the color code for the "63 Airstream.
I tested the continuity at each position/wire color with my Fluke meter.

Green - Running Lights/Tail Light at 1 o'clock
Red - Left Turn Brake at 3 0'clock
White- Ground at 5 0'clock
Blue - Electric Brake at 7 o'clock
Brown - Right Turn/Stop at 9 o'clock
Black- 12V + at 11 o'clock
Yellow - Backup Lights at center

My '55 Safari uses all blue wire inside the shell for the 12V tow/running lights.
There is only a single blue wire to each light fixture. The ground comes from the shell.
The electric brake wire is carried by a two wire shielded cable. I haven't torn up enough flooring yet to see the entire wiring layout for the electric brakes.
fiftysafari is offline   Reply With Quote
Reply


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
Standard or Non-Standard Roof Vent and Skylight man7sell Leaks - Weatherstrips, Gaskets, Caulks & Sealants 7 08-24-2018 02:38 PM
Please Clarify - Tow ratings Happydays Towing, Tow Vehicles & Hitches 14 11-22-2013 04:39 AM
Help clarify my polishing options JoePfznik Cleaning, Stripping & Polishing 2 01-02-2010 10:17 AM
How Can it Be? 2 Plugs work, 2 Plugs dont Aluminumb Electrical - Systems, Generators, Batteries & Solar 10 07-27-2009 07:44 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 11:20 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.