Reply
 
Thread Tools Display Modes
 
Old 02-16-2015, 10:37 PM   #1
Bus Nut
 
Zephod_beeblebrox2's Avatar
 
Join Date: Oct 2014
Location: Lexington sc
Posts: 482
Year: 1994
Coachwork: carpenter
Chassis: international
Engine: 466dt
Rated Cap: 59
Trailer wiring

At some point I will want a trailer. Before I get too advanced with construction, I want to do the trailer wiring. I figure a single power wire with relays tripped by the power at the rear light clusters. Given that the cable needs to carry enough power to light two reds, two ambers and possibly side lights too, what gauge of wire should I use?
Zephod_beeblebrox2 is offline   Reply With Quote
Old 02-17-2015, 03:29 PM   #2
Skoolie
 
Roadrunner's Avatar
 
Join Date: Jan 2015
Location: Johnstown, PA
Posts: 248
Year: 1999
Coachwork: Bluebird
Chassis: TC 2000
Engine: 5.9
Rated Cap: 83
Hello.

I think you can use 12 gauge. For your power to the relay you can use 10 or 12. It might be a pretty long run from the battery. 12 would certainly be good from the relay to the trailer plug. You should't need a relay for the signals but you might have to upgrade the flasher to a heavy duty one I don't know. Try it and see if the current flasher would work. You can use a relay for the brake lights as well if you want to. I would think you can get away without a relay there but I would use 12 gauge there also. Better too much than not enough.
Make sure you use a heavy wire to ground the relay too. Any questions just ask. Good luck.
Roadrunner is offline   Reply With Quote
Old 02-17-2015, 05:22 PM   #3
Bus Nut
 
Zephod_beeblebrox2's Avatar
 
Join Date: Oct 2014
Location: Lexington sc
Posts: 482
Year: 1994
Coachwork: carpenter
Chassis: international
Engine: 466dt
Rated Cap: 59
I was thinking of taking the relay power from the existing lights then taking light power from the trailer from the single power cable. I fancy 10 gauge but am not sure its heavy enough.

I suppose the real thing is to ask Avis, hertz and uhaul how much power their car trailers pull. Brake connections are A whole other game
Zephod_beeblebrox2 is offline   Reply With Quote
Old 02-17-2015, 07:48 PM   #4
Mini-Skoolie
 
Join Date: Jan 2014
Posts: 27
I'm not so great with electronics but what sort of lights are on the trailer and the bus?

I know when converting my motorcycle from regular bulbs to LED I had to get a flasher relay to get them to work properly. I'm not sure if you'll have to do such a thing for wiring up a trailer connector.

As for getting the trailer wired up, you can go either 4 or 7 pin setup. Does the trailer you plan on hauling have brakes? If it's over a certain weight they're required in most states I believe. If the trailer has brakes you'll want a brake controller and you'll need to extend the wiring in that device as well.

I'd try to wire for a 7 pin connector personally, plenty of diagrams and tutorials online that should show you how to do it. Unfortunately wiring trailers to buses doesn't seem too common so you probably can't just find a connector kit so you'll have to do some cutting most likely, try to plan it out and do as little harness cutting as possible!
That Guy in Maine is offline   Reply With Quote
Old 02-17-2015, 07:49 PM   #5
Bus Nut
 
Zephod_beeblebrox2's Avatar
 
Join Date: Oct 2014
Location: Lexington sc
Posts: 482
Year: 1994
Coachwork: carpenter
Chassis: international
Engine: 466dt
Rated Cap: 59
I'm planning on renting trailers. Not much need to own one when all I'll be doing is transporting my day to day vehicle to temporary home sites
Zephod_beeblebrox2 is offline   Reply With Quote
Old 02-18-2015, 12:48 PM   #6
Skoolie
 
Roadrunner's Avatar
 
Join Date: Jan 2015
Location: Johnstown, PA
Posts: 248
Year: 1999
Coachwork: Bluebird
Chassis: TC 2000
Engine: 5.9
Rated Cap: 83
10 gauge

10 gauge is more than sufficient. 10 from the battery even on a long run is good. 12 from the relay to the trailer plug will be plenty. OEM setups don't even go that heavy. You will be fine.
Roadrunner is offline   Reply With Quote
Old 02-18-2015, 06:38 PM   #7
Bus Geek
 
Join Date: Aug 2011
Location: Stony Plain Alberta Canada
Posts: 2,939
Year: 1992
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: 190hp 5.9 Cummins
Rated Cap: 72
We only use 10 ga on the ground and charging wires in a 7 pin connector.

The rest are 14 and 16 ga but yes bigger is better.

Most full size buses have extra runs to the back of 12 ga. They were used to run the amber and red lights at the top for school bus dutys. The amber and the red used two independent circuits, so 2 separate 12 ga wires.

Nat
__________________
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."

Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization
nat_ster is offline   Reply With Quote
Old 02-18-2015, 06:42 PM   #8
Bus Nut
 
Zephod_beeblebrox2's Avatar
 
Join Date: Oct 2014
Location: Lexington sc
Posts: 482
Year: 1994
Coachwork: carpenter
Chassis: international
Engine: 466dt
Rated Cap: 59
Ahh... The top lights will be extra brake and turn signals. I have plans for them and plans also to add a hazard flasher that doesn't exist on my bus
Zephod_beeblebrox2 is offline   Reply With Quote
Old 07-31-2016, 11:39 AM   #9
Skoolie
 
RHOMBUS's Avatar
 
Join Date: Feb 2015
Location: South Dakota
Posts: 196
Year: 2002
Coachwork: Thomas
Chassis: Freightliner HDX
Engine: CAT 3126B250
Rated Cap: 84
Going to revive this tread a little.

I am at the point in the rear electrical that I want to add trailer electrical outlets to handle most trailers I plan to pull. The most common would be a tow dolly, rented, and I think most of those have the flat 4 pin connector. I want to wire up a combination 7,5,4 pin adapter to handle most of the options.

With that said, I have a concern. If there is live battery power, ground and connections to all of the lighting circuits, wouldn't someone be able to just jump several of the pins together and fry your bus electrical system? If so, how could you prevent that other than a locking cap which I have never seen?
__________________
My project: The Cruel Bus
RHOMBUS is offline   Reply With Quote
Old 07-31-2016, 11:58 AM   #10
Skoolie
 
Join Date: Mar 2010
Location: Texas
Posts: 206
Year: 1997
Coachwork: AmTran
Chassis: Genesis
Engine: DT466
Rated Cap: 84
Quote:
Originally Posted by RHOMBUS View Post
With that said, I have a concern. If there is live battery power, ground and connections to all of the lighting circuits, wouldn't someone be able to just jump several of the pins together and fry your bus electrical system? If so, how could you prevent that other than a locking cap which I have never seen?
Fuses. Properly rated fuses.
Timelord is offline   Reply With Quote
Reply

Thread Tools
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


» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 11:27 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.