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11-08-2015, 10:49 PM
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#1
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Junior Member
Join Date: Oct 2014
Location: Mesa, AZ
Posts: 7
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Replacing the 7pin trailer wire
While towing my Puma 31bhss this weekend I noticed I didn't have any lights on the trailer. Once I got to a safe place to pull over I found the electric wire had come disconnected and dragged for a while. There are now spots where bare wire is exposed. My question is, where can I get a wiring diagram inside the junction box to make sure I connect the replacement properly?
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Strangers are just friends you haven't met yet.
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11-08-2015, 10:59 PM
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#2
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Senior Member
Join Date: Jun 2015
Location: Pensacola, FL
Posts: 1,645
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__________________
2019 Coachmen Freedom Express 192RBS
2015 T12RBST Flagstaff Hardside
Disclaimer: The actual value of my "Two Cents" of advice varies just like a bitcoin.
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11-09-2015, 12:01 AM
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#3
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2007 WildCat 32QBBS
Join Date: Jul 2011
Location: NJ
Posts: 2,349
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Here's the diagram of the plug on the trailer and truck end. If you're replacing the entire pigtail from the junction box to the plug end, note the color of the wire at each particular terminal in the plug. Manufacturers don't always use the same color wires like one would hope.
__________________
*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS
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11-09-2015, 06:18 AM
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#4
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Senior Member
Join Date: Oct 2015
Posts: 248
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The pin locations are accurate but wire colors on the trailer side may not be. For example my reverse lights wire on my FR trailer pigtail is yellow.
Eastlake, Ohio
2013 F-350 Turbo Diesel
2016 Heritage Glen 368rlbh
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11-09-2015, 07:42 AM
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#5
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Senior Member
Join Date: Sep 2011
Location: In a big child free home - except for me
Posts: 1,682
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On my first backing of a 5th wheel TT i heard a lot of crunching and snapping... DW thought it was teh truck - I thought it was the trailer axles.
She was right.
Somehow I severed the connection between the pin and the bumper and fried a 32 dollar breaker in the truck shorting the wiring out.
Not only did I cut the line in 2 pieces but I ripped the wiring out of the junction box at the trailer end.
I was kind of shocked that none of the stores locally sell 7 pin wiring and had to go to parts for trucks...
I wired the connections in 2 pieces with a round 7 pin Reese connector at the trailer end and 4 feet of new wiring.
(type that normally fits into the bumper of the truck.)
I then used marine grade Marr connectors in the junction box.
Then I took the 7 pin that fits on the bumper and left it alone at that end
On the cut end I put a female junction made by Reese (in the middle of the second piece) so the trailer male end connects the 2 pieces.
Worked out great because I also purchased a second Female 7 way to 4 way flat connector for tying into the trailer battery and run my park/tail lights when we are at the park on shore power.
__________________
TV 2018 Ford F250, hauling a 2018 KZ 331 TH 12 Sportster 5th wheel, packing a 2015 CF MOTO 800 U-Force SXS
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11-09-2015, 12:58 PM
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#6
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Junior Member
Join Date: Jul 2015
Location: North West Florida
Posts: 11
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7 pin plugs/wiring
I cut mine turning sharp.
Tractor Supply had plugs, pigtail and everything else:
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11-09-2015, 01:09 PM
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#7
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Senior Member
Join Date: May 2015
Posts: 230
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Correct code is:
Black Batt. Pos+
White Batt, Neg -
Blue Elect, Brakes
Green Trailer Running Lights
Brown Right turn/stop
Red Left turn/ stop
Yellow Back up (center)
This is the correct code for all Commercial 7 wire connections, colors are stamped on the plug at the brass connectors inside the plug assy.
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11-09-2015, 01:22 PM
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#8
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Senior Member
Join Date: May 2015
Location: Dunn, NC
Posts: 1,199
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Dog chewed mine---twice!!
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11-09-2015, 01:38 PM
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#9
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Member
Join Date: May 2015
Posts: 78
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Quote:
Originally Posted by pdqparalegal1
Dog chewed mine---twice!!
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Do you still have that dog and/or did you have a nice funeral for it?
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11-09-2015, 02:17 PM
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#10
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nosaint3
Join Date: May 2014
Location: Mostly Louisiana,Illinois,Michigan
Posts: 57
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When I changed out my camper cord to the truck, I just opened everything up so I could see all the wires and then put one wire at a time thru the hole and disconnected one color at a time and hooked each color one at a time until done, then taped with electrical tape. So much fun I have to do it again since I cut it again through stupidity again.
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11-09-2015, 02:34 PM
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#11
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Phat Phrog Stunt Team
Join Date: Apr 2011
Location: South West PA
Posts: 3,012
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FYI
Check this magnetic connector out... pricey but gives you lots of safety and piece of mind,
http://www.ezconnector.com/
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11-09-2015, 04:16 PM
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#12
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Rivnut
Join Date: Feb 2014
Location: Monterey, TN cumberland Plateau
Posts: 170
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replacing the 7 pin trailer wire
Mine fell out of the receptacle on I-65 going to Goshen rally, draged it all the way to Goshen when somebody told me. They put a new one on for me . I tied it up now. use the small bunge cord it to the receptacle now. Can't trust them.
Rivnut
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11-09-2015, 04:41 PM
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#13
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Junior Member
Join Date: Aug 2015
Location: Oroville, CA.
Posts: 26
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Replacing the 7pin trailer wire
Quote:
Originally Posted by MilCop4523
On my first backing of a 5th wheel TT i heard a lot of crunching and snapping... DW thought it was teh truck - I thought it was the trailer axles.
She was right.
Somehow I severed the connection between the pin and the bumper and fried a 32 dollar breaker in the truck shorting the wiring out.
Not only did I cut the line in 2 pieces but I ripped the wiring out of the junction box at the trailer end.
I was kind of shocked that none of the stores locally sell 7 pin wiring and had to go to parts for trucks...
I wired the connections in 2 pieces with a round 7 pin Reese connector at the trailer end and 4 feet of new wiring.
(type that normally fits into the bumper of the truck.)
I then used marine grade Marr connectors in the junction box.
Then I took the 7 pin that fits on the bumper and left it alone at that end
On the cut end I put a female junction made by Reese (in the middle of the second piece) so the trailer male end connects the 2 pieces.
Worked out great because I also purchased a second Female 7 way to 4 way flat connector for tying into the trailer battery and run my park/tail lights when we are at the park on shore power.
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I hope you determined the cause so you don't repeat.
__________________
We Travel Not To Escape Life But For Life To Not Escape Us
2015 Wildcat Maxx T28RKX
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11-09-2015, 05:41 PM
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#14
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Senior Member
Join Date: Sep 2015
Posts: 3,464
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Quote:
Originally Posted by grayfox
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Has anyone used this?
My new ram has no bed prep, so I thought i might give it a try?
2015 RAM 3500 CCSB CUMMINS
2016 Sabre 36QBOK
__________________
2017 Dynamax Isata 4
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11-09-2015, 07:37 PM
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#15
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Phat Phrog Stunt Team
Join Date: Apr 2011
Location: South West PA
Posts: 3,012
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Quote:
Originally Posted by Kenny kustom
Has anyone used this?
My new ram has no bed prep, so I thought i might give it a try?
2015 RAM 3500 CCSB CUMMINS
2016 Sabre 36QBOK
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Yes, I installed one on my 3500 GMC. Very easy install, plug and play to your current wiring harness on your truck assuming you have the tow package with the 5th wheel wiring harness. As far as the install on the trailer you'll have to remove the current wire harness install the new one, again easy install. The magnate in the connector is very powerful making a positive and secure connection. As a side note, because of the smooth contacts and strong connection the brake and running lights seem to be brighter. VERY STRONG MAGNET plus a twist lock on the connectors.
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11-09-2015, 07:42 PM
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#16
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Member
Join Date: Sep 2015
Posts: 71
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Quote:
Originally Posted by PapaE
Do you still have that dog and/or did you have a nice funeral for it?
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You beat me to the question.
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11-10-2015, 10:41 AM
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#17
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Senior Member
Join Date: Jul 2014
Location: SouthWest Michigan
Posts: 5,977
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We had ours get caught under the hitch ball,,, while parking on out property in the forest,,, miles from town,,, burned all the wires,,, I sat for an hour or so and spliced them all back together,,, as a temporary fix... I also found a fuse had gotten fried on the truck,,, went to town the next day and replaced the fuse,,, never did replace the wire !!!
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