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Old 07-25-2014, 06:18 PM   #1
Join Date: Apr 2010
Posts: 43
Cool Trailer wiring

Looking for assistance with our 2000 National Tradewinds. We are the second owners. Previous owners purchased new. This unit came wired with a 6-pin trailer plug. They pulled a tow vehicle with a blue ox. We didn't purchase that component but pull a small enclosed trailer with a 4 pin flat plug which we wired. Needless to say we have 2 pins not currently being used and can't seem to determine what they are. Are they for electric brakes and/or backup lights? One is the center pin. The other is the 10 o'clock 11 o'clock position pin. We haven't explored pulling the wiring harness apart from the back nor can we find anything in the manuals i.e. a wiring diagram. Any help would be appreciated. Is there anything standard with respect to wiring or was this a dealer add-on that may not be wired standard. Would like to be able to pull a car hauler with a 7 pin which will require electric brakes. Where would I look to see if our unit has this feature?

Keith Scott
Thunder Bay, Ontario
2000 National Tradewinds Class A Motorhome
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Old 07-25-2014, 07:51 PM   #2
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Here's normal 6 pin wiring diagram. You can check and see if yours is standard with a test light or multitester.

You can Google to see typical wiring for 4, 6 or 7 pin/blade connectors.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 08-17-2014, 12:07 AM   #3
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Be sure to check the electric brake wiring at the coach end. Mine was wired from the factory with the back up lights on the tow brake circuit, so every time I went to backup the brakes on the trailer would lock up and jackknife the trailer.
2004 DOLPHIN 5320
2001 Dodge Dakota 4x4 Toad
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