Brian
If you've done everything right and the Voltage regulator is working correctly then 20W will make the grips almost too hot to hold onto. Normally the Lo setting is OK for riding and the Hi for warming up after stopping along the trail. Remember the Diod trick and replace the resistor. Any working diod out, out of a TV or radio, will do the trick.
The best way to get even heat on both sides of the handlebar is to put a plastic pipe on the left side of the bar. I've found that the type of plastic pipe used to run electrical wiring in houses are perfect for the job (see the attached picture). When cold it's to small to fit but when heated up carefully with a heat gun it will slide onto the bar. As soon as i cools it grips. I then cut the excess off and put the heating element on top.
Kent
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