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Old 08-15-2009, 11:15 AM
bigmac bigmac is offline
MC Platinum
Join Date: Jun 2005
Boat: 2004 Maristar 230 VRS
Location: Central Minnesota
Posts: 8,324
Most RV's have a 7 round terminal and need a 7-round to 5-flat adapter. Assuming your trailer has a solenoid to disengage the surge brakes when the vehicle is in reverse, you need to activate that somehow. That's the blue wire on the trailer side of the connector. Any 12 volt source applied to that blue wire (and the ground of course) will engage that solenoid. If your tow vehicle doesn't have a reverse signal to it's connector (which it won't if it is indeed a 4-round connector) then you could wire from your backup lights to that blue wire, which will then allow the trailer to back up when you put your vehicle into reverse, and you can avoid using the mechanical lockout
'04 MariStar 230VRS/MCX
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