I am installing a set of 10-3/4” KST Mayhem bars with HD OEM heated rubber grips that are installed on newer Ultra Limiteds. I ordered the grips RH part # 56249-10 and LH part # 56209-10. The left hand grip as a core on the inside with 2 plugs, each with 2 wires attached coming out of the core. The wires are about 16” long. The wires are fed through the end of the handlebar and down toward the exit hole at the riser… the core inside the grip slides into the handlebar and the grip slides over the handlebar….which means that these grips can be wired internally. I have 2 questions: (1) What gauge and type of wire is used for these grips? I need to extend the wires by splicing a section into each of the 2-starnd leads. (2) There are 2 plugs…and I know one is to pick up power for the dead head plug under the right inner fairing (looking from the front) and the other connects to supply power to the right side grip, supposedly found near the riser. Since I have not yet opened up the fairing to root around and look for the plug ends doe these grip wires, can anyone tell me if the gender of the power plug (male of female) and the left grip to right grip plug? The leads coming out of the left grip are male and female, though I don’t know which is power and which connects the right grip. Part 2 of this is if the pre-wire under the fairing at the riser has the proper plug to match the proper grip lead? Also, I am changing the Throttle Sensor Wire to the one-piece SE TBW so I don’t have to deal with the plugs found in the stock harness.

 

The gauge is probably around 20, it's pretty small. You have the wires in your hand match them to wire rolls at an auto parts store. Going larger is not going to hurt electrically. Match one of the left plug to the right plug, the remaining plug goes to an unused plug behind the fairing. If I recall correctly the plugs only fit one way. If you're still having trouble ask your friendly HD parts guy to let you see and copy installation instructions from a heated grip package if he has one is stock. HD used to have a link to the installation instruction on their web site under the information areas in the part description and fitment information.