We used Gerbings liner for several years, then switched to Warm & Safe liners about 5 year ago as they are quite a bit less bulky than the Gerbings. Harness wired directly to the battery with coax plug-in as most others are doing.
Originally used hard wired Heat-troller, but have been using wireless Heat-troller for 7 years with good success. The controller is zip tied to the left handle bar. Hereís a pic I already had that sort of shows the controller. I leave on the bikes all the time.
'17 SuperSport S, Akra Slip-ons, touring w/s, hard bags, etc.
'12 Multistrada 1200S Touring, full Termi., (sold)
'10 848 Hayden SE, full Termi. (sold)
Ď04 ST4s, full Termi., PCIII (sold)
'04 BMW R1100SA BCR, Staintune, Ohlins