I upgraded my 500 to an FM750 I already had the EZsteer. The Dealer sold me a extra power cable for the ezsteer and told me that my 750 cabling didn't a place to plug the ezsteer into. So does the power cable he sold me plug into P3 on the ezsteer T2 cable  and the cable for 750 does have a end marked P2 Can that plugs into the ezsteer plug S1 also on the T2 cable. Is this correct I can't get ahold of my dealer today, day off I guess, and there is nothing in the manual about this. I haven't powered anything up yet either.