I have not removed the throttle side, but I have replaced the entire heated grip on the clutch side. It is held on by 2 Phillips head screws....one on top and one on the bottom. In order to see them, the rubber has to be folded back slightly. The worst part of the job is getting at the wiring connector. I did the job in conjunction with a 12k service while I had the tank off. The wire runs through the handlebar tube and then to the connector in front of and slightly to the left of the tank. This connector is a nylon type and extremely difficult to remove and replace the wires. Both grip sides go into the one connector. By the time I finished, I ended up replacing the whole thing with an easier style from the local electronics shop.
I used stainless safety wire attached to the existing wiring as I pulled the old wiring through the bars, so that I could easily feed the new wires back forward.
Hope that helps,
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735,834 miles on touring motorcycles since 1990
IBA 45658 MOA167437
2000 LTC 90,600 miles KIA (new)
2003 LTE 164,188 miles Silver (Purchased with 1687)
2008 R1200RT 176,196 miles (Purchased with 16458)
2017 R1200RT 84,612 miles (new)
Total BMW miles 497,451
1982 GL1100 rode 84108 miles (bought with 12012 sold 96120)
1988 GL1500 rode 12067 miles (bought with 19893 totaled 31960)
1989 GL1500 rode 142208 miles (bought with 20302 sold 162510)
Goldwing miles 238,383