Is anyone savvy on the value and wattage ratings of the resistor(s)? A high-quality, low-cost replacement and weatherproof enclosure could probably be sourced through Mouser or Allied Electronics. Alternative connector/socket ends for the wiring harness could be found there as well.
On second thought, the existing unit could be gutted and internals replaced, saving the additional enclosure/wiring connector steps.
If anyone has a failed unit that they could send to me, with info on correct values/wattage ratings (color codes might be on the resistor(s) inside the unit), I could write up a low-cost internals replacement "how-to" after successful replacement of resistor(s)/testing. If you guys are (or have friends that are) handy with a soldering iron, this could be a not so hard way to save a few dollars.