Heated Grip Gone Out - Advice Needed

I finally, just in time for warm weather, installed some new heated grips- the Oxford Cruiser. Someone described them as "the bees knees," and I have to agree. Basically, not too hard to install except that the throttle tube that came with it binded on the Roaster setup. I ended up having to strip the Triumph heated grip off the the inner throttle tube and use that with the Oxford grip. Might be good to know if you think this will be a quick change. Otherwise, pretty basic install.

I got a set of Oxford grips attached in the middle of our summer here in New Zealand.

Heading to the last Brass Monkey rally in June where it can get down to -18c

Hopefully won't be that cold.