Anyway, I made it home and found the electrical problem and the "Clunk" at the
same time. The clunk was the battery plug, clunking at the end of its 6 inch
lead. All this clunking broke the wire at the solder connection to the battery.
I now have the plug epoxied to the battery and I'm clunk free at last, clunk
free at last, Thank God all mighty, I'm clunk free at last.

The best off the shelf connector between removable battery and
the glider I have seen is a male/female "electric lighter"
setup (y'know, like a cigarette lighter). They're easy to insert
and remove and large enough to manhandle.

After having wires bend and fray, I now tube/shrinkwrap my
electric connections so they don't get as much mechanical play up
and down.