Steve, thanks for sharing a much simplified, and inexpensive, circuit for a dust bin sensor. I purchased the exact same sensor and flasher unit and it works great on my DC system. Interestingly, the LTE-5061 flasher I received had 2 red leads and neither was marked. I guess they must have run out of black wire that day. A quick connection to just the power supply showed which one is positive. This little flasher is brighter than I imagined it would be.