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Old 01-01-2011, 11:30 AM   #1
Fleetwood Owners Club
Join Date: Oct 2010
Posts: 41
Question Motor Home Trailer Wiring

I have look at some past Thread here and still have some question on how the motor home trailer wiring is wired. I have a 2000 Fleetwood Bounder 39Z on a freightliner chassis. The MH is new to use as of late Sep. 2010. Dose anyone know how the trailer plug on the MH is wired into the motor home wiring or chassis wiring. I have tried both MFG's and not much help. Dose anyone know where to get the wiring diagrams for the MH and Chassis

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Old 01-01-2011, 01:14 PM   #2
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Newmar Owners Club
Join Date: Dec 2010
Location: Fort Worth, TX
Posts: 20
Get a Volt meter from someplace like Radio Shack. then attach the ground (black) lead to a good ground on the back of your coach with something like a pair of vice grips. Now turn the ignition on and the left or right turn signal. If you have the meter set on the DC volt setting that is just higher than 12 volts and touch the red lead to the pins on outlet receptacle you will find the contact that shows a alternating off and on current. Note the location and repeat for the other turn, then the brake light, then turn the headlights on and read for the marker lights.
On the tow vehicle i run wires from the front to the back using any brackets or existing wiring looms as the support. Then open up the tail lights and using the meter and the same trick as on the coach I locate the appropriate wires. Then I splice the new wires into the existing wires. I use a diode I get from Radio shack to make sure the power from the coach can only go into the bulbs and not back into the vehicle wiring. I don't know if this is what you needed but hope it helps.

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Old 01-02-2011, 04:09 AM   #3
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Thanks Jimcounts: I'm sorry that I was not very clear on what I needed. I have found the following out so far. Left turn and brake are yellow, Right turn and brake are green, Running/marker are brown and the Ground is black. which I think is normal. What I'm not sure of is the Red wire coming out of the MH wiring harness. This red wire is Grounded with the MH engine is off it only seems to get 12 volts when the MH is started and the Brakes are applied but I'm not 100% sure. I could use it for a trailer that had electrical brakes. If the trailer (which I do not have yet) has a break-away system I would have to do something to the wiring on the MH to keep the trailer battery charged. I'm just looking ahead. Also still would like to get a good wiring manual/schematics for the MH. Good point about the diode. Again thanks for the help
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Old 01-02-2011, 12:43 PM   #4
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Posts: 1,068
Here is a link that might be helpful

RV Wiring
2001 34' Alpine Coach
2008 Jeep Rubicon or 2012 Ford F150 4x4 Lariat towds
or a couple of different trailers
Retired in Apple Valley, California
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Old 01-03-2011, 08:34 AM   #5
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Newmar Owners Club
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Location: Fort Worth, TX
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I needed a wire to keep my Jeep battery up also. I ran another wire to a fuse and then to the battery. My batteries are about 5 feet from the hitch so it was pretty easy. I found one of the post on the rv was not used so I tied my 12V into that and then added another wire to the hitch cord wiring and attached that to my battery on the Jeep.
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Old 01-03-2011, 09:16 AM   #6
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Damon Owners Club
Freightliner Owners Club
Join Date: Mar 2006
Location: North East Texas
Posts: 3,746
if you have the standard 7 pin trailer connection at the rear of your coach
there should be a battery charge or 12v line that is LIVE with the engine running, this can be used to keep your toads battery up,

and..... call freightliner again 1-800-385-4357
and ask with a bit of tact.....
for a pdf of the trailer wiring from the dash interface to the rear of the coach
2000 is older...but 7 pin wiring hasnt changed in a long time

does your rv have a brake controller already installed up front at the dash?

post a pic of both of your plugs at the rear of the coach.
does it have a 4 or 6 round for a tow bar set up?
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, no your eyes are fine, there are really 6 slides
2016 Expedition Toad on Hauler flat bed
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Old 01-04-2011, 06:09 PM   #7
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Fleetwood Owners Club
Join Date: Jun 2009
Posts: 4,031
Fleetwood Customer Service Put a Check mark at: "I need information or have a question about parts for my RV.

Fill in all information vin etc.
At bottom box ask for 12V & 120V wiring/schematics for the MH and chassis. Also Plumbing.
They will send PDF attachments back in a e-mail.

99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
Fulltime Since "99"
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