Devanshu_Acharya,
Thanks for yet another update to your response. From some other things I had read on the web about MOSFETs, I thought (as your most recent schematic shows) that the load would go between the high voltage (the output from my voltage regulator) and the drain on the MOSFET. Then when the gate is energized, current would flow through the load, the drain, and then out the source to ground. Just why the names "drain" and "source" seem to be backwards is a mystery to me. I'd think they'd be the other way around. I guess it's because this is a N type MOSFET. But as I said before, as long as it works!
Many thanks!