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Trucks, Trailers and Hauling for Shows

Trailer plug?


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  #1  
Old 11-17-2012, 07:50:03 PM
Tom Nowak Tom Nowak is offline
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Default Trailer plug?

I just got a used toy hauler camper, which has the 7 pin camper stype plug( going to haul some engines around to shows with it and camp All my trucks are wired for the 6 pin plug like on stock trailers. I got an adapter to go from 6 to 7. What I would like to know what is the big center post on the camper plug for? Is it used as a hot wire for say charging the camper battery from the truck? The adapter makes all the lights and turn signals work. On my other trailers I got the ground through the hitch, is one of the extra pins on the camper plug for the ground? These are all the round plugs ,the one on my trucks are just smaller. I tried looking it up but could not find out for sure what the center pin was for. I took a test light and a battery and and could tell what most of the pins were for. One side pin when I tested it with a battery seemed like a dead short is that a pin for the ground?
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Old 11-17-2012, 08:13:55 PM
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Fred Van Hook Fred Van Hook is offline
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Photo Re: Trailer plug?

According to the instructions I have it is called BU and is for Backup.

Found a picture...
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Old 11-17-2012, 09:21:31 PM
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Default Re: Trailer plug?

If you are relying on the hitch to provide the ground I can guarantee your lights are doing some really strange things while running down the road, and your electric brake action will also suffer. Reliable ground can only be provided thru the lighting cable and plug. If you are reading a dead short on one of the side pins, you have indeed found the ground connection.

The 7 pin flat connector plug is most commonly referred to as a 7 pin RV plug, and is now standard equipment on every trailer ready consumer sized PU and SUV sold in the US and Canada. Every trailer I have seen in the last few years comes with the 4 pin flat, or 7 pin RV if it has brakes. Only extra connection from 6 to 7 pin is the B/U lights. Here is the 6 pin for reference. Hope this helps.
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Old 11-17-2012, 10:00:50 PM
Tom Nowak Tom Nowak is offline
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Default Re: Trailer plug?

Thank you Toesmack
I guess I didn't look hard enough for the information. I was thinking the center pin was for the battery on my truck. You would think it would be the same on the other. Even the wire colors change for the different functions. I am pretty sure I do not have a 12 volt wire from the truck wired up. If I run a hot wire from the truck through the plug will that charge the battery on the camper? Also what gage wire should I use if so?

---------- Post added at 08:00 PM ---------- Previous post was at 07:54 PM ----------

My bad about the colors, didn't look close enough. One of the charts I found I though they changed colors for different functions.
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Old 11-17-2012, 11:14:07 PM
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Default Re: Trailer plug?

Yep, it'll charge the trailer battery just fine, provided the trailer has a lead to the battery. Add a fuse or breaker close to the truck battery to protect the system from any ugliness that happens downstream. I use a 30 amp, plenty heavy, but will still pop if you happen to let the magic smoke out. I normally run a minimum of a 12 ga. wire, but see that the truck manufacturers usually run some pretty small stuff, and I have not had any problem with the factory supplied wiring.

Note, if you have a power draw in the trailer, it WILL also drain the truck battery. Simple fix, just unplug trailer if hitched up for several days. Cheap insurance.

Happy wiring!

By the way, you can't always bank on the colors being correct. Seem plenty of 'em switched by previous experts.
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Old 11-20-2012, 05:04:13 AM
06 Diesel 06 Diesel is offline
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Default Re: Trailer plug?

Here are some helpful pictures for you to use as a reference. As stated above, never trust the coloring, trailer companies just seem to use whatever they have laying around it seems. I have re-wired almost every trailer I own or use on a regular basis, as well as a few for friends or family. When re-wiring them I always make sure that they are properly colored and run every wire, most companies only run 6 wire with the 7 wire RV plug because there is not a back-up light on most trailers.
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Old 11-20-2012, 07:13:30 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Trailer plug?

[QUOTE=Tom Nowak;839443]Thank you Toesmack
I am pretty sure I do not have a 12 volt wire from the truck wired up. If I run a hot wire from the truck through the plug will that charge the battery on the camper?

On some of the GM trucks you had to connect the wire to a stud on the rear of the fuse box, it was hanging loose near the master cylinder, you then had to install a maxi fuse in the fuse box.
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Old 11-20-2012, 12:02:41 PM
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Default Re: Trailer plug?

I run dual batteries under the hood of my truck and my jeep for charging the trailer and for power to the Ham Radios, CB, and winch. I run my 2nd battery on a battery isolator (available At most automotive audio dealers) the isolator isolates the 2nd battery from the primary when the ignition is turned off, that way I always have a primary battery for start up and a 2ndary battery for all the toys. Plus, my 2ndary is a deep cycle RV battery so it will last days while running any of the accessories, even with the vehicle turned off.
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Old 11-20-2012, 12:09:07 PM
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Default Re: Trailer plug?

Yes, it will tie the trailer battery to the truck battery in parallel provided the trailer battery is wired to the plug also. This will charge the trailer battery when the truck is running. Just be aware that when tied together, and using the trailer power, you will also be discharging the truck.

On some of the GM trucks, they had a auxillary battery under the hood for your camper power. These had a isolator or "splitter" that prevented discharge of your truck engine battery when parked.

Could be the same system tied to the stud?
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