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Old 12-04-2020, 08:32 PM   #1
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Wiring harness for brake controller on a 2006 National tropical RV?

Hello, can anyone tell me where the harness is under the dash for the brake controller attachment for a 2006 National RV tropical 370 LX? If anyone has used the harness and attached the brake controller to pull a trailer I would really appreciate advice and pictures! Thanks so much!
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Old 12-04-2020, 09:25 PM   #2
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Quote:
Originally Posted by ColleenRick View Post
Hello, can anyone tell me where the harness is under the dash for the brake controller attachment for a 2006 National RV tropical 370 LX? If anyone has used the harness and attached the brake controller to pull a trailer I would really appreciate advice and pictures! Thanks so much!
Not your vehicle specifically, generally:

Get a multimeter and test which wire has current when brake pedal is pressed. Then splice that wire and power the controller directly to your battery. Remember to put a fuse.
Hooking up the lights should be easy, just plug it in.
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Old 12-17-2020, 12:46 PM   #3
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On my coach there was no factory harness. I spliced into everything in the 12 volt fuse panel on the drivers side.
Yellow wire #52 is the brake switch.
Yellow wire #34 is the ignition switch.
Blue wire #45 is the trailer brake wire.
On my coach, the blue wire was spliced into the transmission relay panel and used for backup lights. I cut it and spliced it to my brake controller harness.
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Old 12-18-2020, 08:38 AM   #4
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ColleenRick,

I have a 2006 Tropical. The wiring harness is tucked up under the left side of the steering column (as you are looking out the front windshield). You may have to do some digging with a flashlight. I got the following adapter from Amazon: Tekonsha 3027-P Trailer Brake Control Harness 2-plug Wiring Adapter - Freightliner.
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