E350 2009 trailer brake wiring?
I jet purchased a used 2009 E350 that has no towing package. I am making it tow ready. I have added a hitch and wiring is set, except for the trailer brakes. I have read conflicting things...... Dealer said that I have to purchase a new master cylinder in order to tow. Others say no. I know I can get an adaptor for my brake controller to fit into the factory plug that is in the dash area. Should I use this plug? Or wire it directly? If I use the plug, where is the other end of the plug?
Thanks in advance!