It's usually the left one that goes first because you use that one to heave the bike on to its centre-stand.
You might be able to repair it by hard-soldering the ends back together, but that is a bit tricky because you need dull red heat to do it, and a soldering iron is not hot enough for the job.
Peel or roll back the outer rubber grip and expose the heating element. You may have to be brutal to do this, but it can be done with a bit of care.
Unwind the two broken ends a turn or two and clean them with emery cloth, twist the ends together with a pair of pliers with CLEAN jaws, (you must keep the surfaces clean or else the solder will not adhere to the wire) heat with a small propane flame (you might get away with butane) and apply the silver solder. Note that this is quite different to the solder that is used for ordinary copper wire joints, that has tin and lead in whereas silver solder has copper and silver and so needs a higher temperature to melt. You will also need some flux to cover the joint before heating it, I used brazing flux (SIF Bronze) but that's just because I had some handy. Let me know and I'll send you some if it saves you buying a tin- you only need a tiny amount anyway. Actually there's proper silver solder flux to be had but the above worked fine for me.
All that may be a bit of bother but it was certainly a whole lot cheaper than buying a set of BMW heated grips.
Try not to let the bike catch fire, but if it does, don't blame me!
Hang on- just realized you're writing from Mexico, you drive on the right hand side of the road there, so perhaps the handle to put the bike on its stand is on the other (Right hand) side. Anyway....
Best wishes
John
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Johnefyn
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