You will need a 7-way, RV Female socket mounted on the rear of your truck...
If the additional 3 wires aren't taped over near where the 'flat four' connector is that you have now, you'll have to run a 'charge wire' and 'electric brake wire' to the back...the third extra wire is a 'backup' lamp wire, and would be easy to tie into your truck backup lamps...
If you can find these three wires already in the rear harness, you may still need to install a couple of fuses in the fuse box under the hood to 'activate' them...
You will then need a 7-conductor electrical cable to connect to the trailer - a 7-way, RV (flat connectors) male socket on one end, and a 7-way 'round pin' male on the other to hook into your AS's F/M socket which is different than the truck's F/M socket...
If you have to run additional wires in the truck, it's probably best to seek the advise of someone familiar with this type of wiring, as you need the proper size wires, fuses, and probably a relay for the 'charging' wire, etc., etc...especially when tying into the Brake Controller you'll also need...
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Ray & Pat; Morada, CA
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