I have a 2012 RX450h with a Curt hitch wired for 4-pin flat connector. I'm looking to buy a lightweight travel trailer, which would require a 7-pin trailer connector. There are converter kits that use the existing 4-pin connector with a 7-pin connector. I did some searches on the forums, but didn't find anyone actually having done that. I'm interested in both the mechanical and electrical connections of the 7-pin connector. Since the battery is in the trunk on 450h, the wiring "should" be fairly straight forward.
Anybody done this ? Any help and tips would be appreciated.
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I recall the Lexus 4 pin connector harness plugs into another plug up under the rear bumper. Not sure how many pins that has. I think this is pretty standard as my old Ford Explorer had the same arrangement. Wonder if it has 7 pins....probably not or would not need the adaptor.
I have the Curt on my RX350 that has the towing package.
So the converter kit of 4 to 7 is not plug and play? It does not sound like much of a kit if you have to wire it to the battery when you already have the 4 pin connector. I recall the 4 pin connector harness plugs into another plug up under the rear bumper. Not sure how many pins that has. I think this is pretty standard as my old Ford Explorer had the same arrangement.
Based on the little research I did, those conversion kits (e.g. http://www.etrailer.com/p-ETBC7.html) have a mating 4-pin connector for the existing trailer connector, but in addition there are 4 new wires for ground, 12V to the battery, brake signal to the brake controller and reverse light signal, that need to be individually connected on the car side.
The RX has a 4-pin wiring harness under the rear bumper, which works great for the 4-pin connector, but like said, those additional wires need to be individually connected. For 450, battery is in the trunk, which makes things little easier, but I'm curious how people have pulled the brake controller signal to the front of the cabin. Also curious how people have mechanically attached the 7-pin round connector, just screwed to the bumper ?