Backup lights on trailer - Fiberglass RV


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Old 01-26-2015, 09:51 PM   #1
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Backup lights on trailer

For those who have installed backup lights on your FGRV, have you had to modify the wiring system with any relay device since the extended wiring from your tow vehicle may not work?

I am going to install a new 7 pin harness and was wondering if I can just add the extra 10 feet of wiring and put on backup lights on the rear bumper of the trailer.

Dave Heffner
Roseburg, OR
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Old 01-26-2015, 10:46 PM   #2
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Dave, that's the same thing I was wanting to do, so I will be anxiously awaiting the experts responses. I would think that if you used LED back-up lights, you should be fine without a relay. These are what I was planning on using, only 220mA.
http://www.superbrightleds.com/morei...uct/1251/1979/
Good Luck
Dave & Paula
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Old 01-26-2015, 10:59 PM   #3
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You can use the center connection for backup lights. It is not used for the trailer lights, or the 12V power. You would just have to run a wire from the end of the trailer pigtail to the light location. As well, it is likely you may have to connect from the vehicle backup circuit to the connector too.
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Old 01-27-2015, 09:59 AM   #4
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Quote:
Originally Posted by Jim Bennett View Post
You can use the center connection for backup lights. It is not used for the trailer lights, or the 12V power. .
That depends on how the trailer & tug are wired. My truck came wired using the Heavy Duty Truck 7 way wiring code so the electric brakes are using the centre pin. That matches up with how the Scamp is wired as well so it was a simple plug and play.

E-Trailer has good Diagrams of the 3 different possible configurations for a 7 pin connection.
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Old 01-27-2015, 10:46 AM   #5
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If you want the backup lights to perform as a signal to other drivers that you are backing up then you can go the conventional route. You can buy RV taillights with the backup lights built in. my scamp had them from the factory.

If you want backup lights for the purpose of seeing your camp site when backing in, then youmight try this...

place one or two small driving lights facing straight down behind your rear bumper.
wire them from your battery through a switch and out to the trailer.
This will light up the area beautifully and you can even see your tires and all the area around and on both sides.
This could even be done without the the tow vehicle being involved by wiring them to the trailer battery with an onboard switch. if you use LED backup lights then you could even use them as a homing beacon on your trailer when you leave your campsite at night.
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Old 01-27-2015, 11:34 AM   #6
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Quote:
Originally Posted by Carol H View Post
That depends on how the trailer & tug are wired. My truck came wired using the Heavy Duty Truck 7 way wiring code so the electric brakes are using the centre pin. That matches up with how the Scamp is wired as well so it was a simple plug and play.

E-Trailer has good Diagrams of the 3 different possible configurations for a 7 pin connection.
This is the standard wiring from your link which is what I have in my Ford F-350, and my Honda Pilot, and what I am used to, though have lead a sheltered life. I have never seen anything different in what I have owned or worked on. I have never seen other than the blue used for brakes. The yellow is for any axillary circuit, or brakes. Maybe others have seen this anomaly you refer to Carol, and will chime in.



Even if the did use the center pin for brakes, that would leave open the one normally used for use with backup lights. A quick test with a meter will tell the tale.
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Old 01-27-2015, 12:14 PM   #7
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Backup lights

Jim's diagram shows the configuration of my new 7-pin connector. I haven't checked to see if my tow vehicle had the yellow(auxillary) wire connected. I can not imagine that a 2012 Tacoma would not be factory connected.

However, Floyd has me thinking that a manual switch with perhaps more than two lights would be very useful. I particularly like the idea of lighting up the sides of the trailer, facing down and out, that would be very useful.

I have a couple of utility trailers with 4 pin connectors, and home made pigtails showing the yellow(left brake), green(right brake), brown(tail light) configuration that Carol uses. One of those trailers has wiring that is pretty lengthy and I have never had a relay involved, so I guess I'm okay in that regards.

I've got so many DC lines coming out of my new PD4045 that needed a place to go. I'm now thinking that my view backing will really be enhanced. I will call that the 'Floyd' lights.

Dave Heffner
Again, thanking the group for ideas.
Roseburg, OR

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Old 01-27-2015, 01:38 PM   #8
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I have wired my reverse lights to the 7 pin harness through the connection box where the harness branches off. I also added a light switch to the out side of the trailer. My tow vehicle isn't equipped with the 7 pin wired for reverse lights.

If another tow vehicle is equipped, then the lights will be activated as normal. While disconnected or connected to a tow vehicle without proper wiring, a simple flick of the switch by the door illuminates the reverse lights when needed from the trailers battery.



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Old 01-27-2015, 02:27 PM   #9
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I agree with Jim, I have never seen the center pin used for anything except Back-up/Aux use. To add to that, there are any number of 7 pin socket testers on the market that are labeled as to which LED represents what. If someone reinvents the configuration they will display incorrectly.
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Old 01-27-2015, 02:30 PM   #10
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Reverse Light(s)

Quote:
Originally Posted by EcoHeliGuy View Post
I have wired my reverse lights to the 7 pin harness through the connection box where the harness branches off. I also added a light switch to the out side of the trailer. My tow vehicle isn't equipped with the 7 pin wired for reverse lights.

If another tow vehicle is equipped, then the lights will be activated as normal. While disconnected or connected to a tow vehicle without proper wiring, a simple flick of the switch by the door illuminates the reverse lights when needed from the trailers battery.



Sent remotely
Not only that, you might want to be able to turn those lights ON when you aren't connected to the tow rig. Or, you could wire it both ways just by tying in a simple switch between a fused source on the trailers battery and the line to the lights.
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Old 01-27-2015, 04:10 PM   #11
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The factory installed 7 pin connectors on my past 2000 Jeep Cherokee, 06 Jeep Liberty and 07 Silverado all use the center pin for the backup lights that correspond to how my 1999 Casita 17' is wired.

I think Carol's wiring diagram is used on tractor trailers.
Can any 18 wheelers verify that?

Joe
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Old 01-27-2015, 04:15 PM   #12
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Quote:
Originally Posted by Joe Romas View Post
I think Carol's wiring diagram is used on tractor trailers.
Can any 18 wheelers verify that?

Joe
Well, I have a Class I license to drive the buggers, but have not worked on the wiring of them. I don't think this would be the case though, as all the big trucks I have driven use air brakes. I do wonder about the electric over hydraulic brakes though.
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Old 01-27-2015, 04:55 PM   #13
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To answer Jim; Big trucks / tractor trailers use two pins for tail & marker lights, all the markers are not on one circuit but split. That's so if one fuse or breaker fails some of the lights are still on. Brake lights are another pin. That leaves one pin for left turn, another pin for right turn, one pin for ground. The remaining center pin is an auxiliary circuit, could have been used for interior lights in a dry van trailer, newer trailers may have used it for the ABS circuit. Been retired from working on those big trucks for 4 years now, trying to forget about it. Never saw a trailer with electric over hydraulic, all the ones I worked on were air brakes. In the northeast we were constantly repairing wiring and lights. So disregard this wiring setup for RV's.
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Old 01-27-2015, 05:18 PM   #14
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Quote:
Originally Posted by mary and bob View Post
Been retired from working on those big trucks for 4 years now, trying to forget about it.
Doesn't seem to be working.

Thanks for 'splaining things.
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