What I've done is purchase a 12v Cigarette lighter adapter for my Garmin, the cut it open. I then filled the entire unit with epoxy, efectivly enasing everything. The I harwired the leads to a power source that is switched with the ignition, and mounted the unit under the seat. It has held up great. Bridge rectifiers, and volage regulators used on enduro bikes often have their electronics encased in epoxy.
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