SECTION 1 - Ultima Products Ultima® Complete Electronic Wiring System . This new wiring system uses all the latest high tech electronics to make wiring your bike easier. All flasher, relay & circuit interrupters are included in one small package that can be mounted in a wide variety of locations. Amazon: ultima wiring harness Amazon: ultima wiring harness. Skip to main content. ULTIMA 18-533 COMPLETE PLUS ELECTRONIC WIRING SYSTEM FOR HARLEY CUSTOM CHOPPERS. by Ultima. 4.4 out of 5 stars 5. $151 $ 151. 89. FREE Shipping. Only 1 left in stock - order soon. Ultima Complete Wiring Harness Kit For Harley-Davidson.