Coast Resorts Open Roads Forum: Folding Trailers: trailer wiring adapter question


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kaptn

simkoe kounty, ontario

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Joined: 06/29/2009

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Posted: 04/14/11 06:18pm

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i've purchased a reese flat 4 plug to a 7-way round adapter..#74184.
my truck has the flat 4..trailer has round 7...there are three extra wires at the flat 4 end, fat blue,black&yellow wires..what are these xtra wires for?
the trailer does have electric brakes

package didn't have any instructions in it

Old-Biscuit

Across the USA

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Posted: 04/14/11 06:26pm

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THIS should cover your connection questions.

SWD

North of the 49th

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Posted: 04/14/11 06:34pm

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Old-Biscuit wrote:

THIS should cover your connection questions.

Thanks so much! What an awesome page!

opnspaces

San Diego Ca

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Posted: 04/14/11 06:36pm

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If your trailer has a 7 pin round then it most likely has electric brakes. The flat 4 wire on the truck means that it only controls the tail lights, turn signals, and brake lights.

The other wires would be
+12V input to charge the battery and possibly run a 3 way fridge

Electric brake control

The last one I'm not sure about but it could possibly be reverse lights if the trailer is so equipped.

If the trailer has electric brakes then you should probably buy and hook up an electric brake controller in the truck and get a 7 wire plug on the back of the truck to hook up to the trailer.

1996 Suburban 4x4. 350, 4.10 3/4 ton
2005 Jayco Jay Flight 27BH
1986 Coleman Columbia Popup.

K Charles

Connecticut

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Posted: 04/14/11 06:37pm

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Maybe white =ground, Blue = brake controller, and yellow MAYBE to battery
reese says "Extra wires for adding brake controls, back up lights or hot wire"

* This post was edited 04/14/11 06:48pm by K Charles *

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