Trailer coupling wiring

Submitted: Wednesday, Mar 11, 2009 at 07:40
ThreadID: 125458 Views:4321 Replies:3 FollowUps:0
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The 7 wires for the trailer coupling includes the 12V positive power wire which on our van side when unplugged is live. I have only recently given some real thought to this wire and realise I don't know or understand the purpose of this wire which is obviously connected to the van DC power supply. Five other wires (and earth return) are dependent on vehicle power supply.

Can anyone enlighten me on the purpose and linkage of the heavy 7th power wire.

Greatfull for clarification on a relatively basic issue.

Regards
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