ThunderMax Pigtail Harness This pigtail harness allows a second port for the communication cable connection to the ThunderMax It is installed to the bike's wiring harness at the 36-pin ECM connector (connection requires harness plug disassembly; two terminated wires are inserted into two unused ports in the 36-pin connector, and a ground wire added) Handy for motorcycle models with tight clearances around the ECM such as Dyna, Softail, Rocker and 2002-2005 V-Rod models Requires ThunderMax ECM with serial number 114000 or higher (produced beginning August 2008) Will not work on previous model ThunderMax ECM's