Yeah, THAT would work. Using the charge jack will not work because, as I said earlier, the charge jack is hot when the switch is turned off, so you do not get a loaded measurement with the voltwatch. You DO with an ESV though, because the ESV provides the load.

Alex.. I don't have a picture here, but it's a simple thing to do. Just cut a rectangular hole through the hull of the fuselage, around the switch somewhere. Make the hole the same size as the LED strip on the voltwatch.. what about 3/8 " by 2 inches long? Large enough for you to see the LED's and at a location that is not blocked by the wing (high wing planes) or anything else, for that matter. Just somewhere where it is visible from outside the plane when it is fully assembled and ready to fly. Then tape the Voltwatch inside the fuselage so that the LED's are visible through the hole you just cut. Paint the raw balsa with nail polish, then cut a strip of clear monocoat and cover the hole.

On my Seagull Super Star, I actually mounted it in the bottom of the cockpit in front of "the pilot" figure and painted the area around it flat black to match the inside of the cockpit bottom. It is clearly visible from anywhere along the top of the plane.

Plug the voltwatch into a vacant RX channel, or if you prefer, use a Y cable and connect one end of the Y cable to a servo, ther Y part to the voltwatch and the Y connector into the channel on your RX that the servo was plugged into.

CGr.