yes, the alternator creates AC, but its then rectified on my XRR. ie the AC component is zero. ditto Martin's, Tim's and Karim's so I've no idea why yours isn't. Martin, Karim, Tim and I have all used Garmin's without any drama.
its also regulated to 13-14v. this is just a batteried Honda which suggests they use the same regulator/rectifier. the 18v at peak revs would be between the rectifier and regulator if it exists at all. have you actually measured it or is someone misleading you?
have you got some odd import? eg an MX version that I haven't heard of? I did 25,000km without any grief and wouldn't go adding complexity to the power supply without really knowing I needed to. as it happens, we didn't need to with our bikes and doubt you need to with yours.
good luck, though
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