Try this site - the tender comes with a fused battery harness and
plug. It could be switched (plug side of inline fuse) for additional
safety.
My plug comes out in the glove box (the battery is behind the passenger
seat). I can also plug my heated jacket liner (and controller) into
it to keep warm on really cold flights!
Scott Krueger
AKA Grayhawk
N92EX IO320 Aurora, IL (KARR)
Some Assembly Required
Using Common Hand Tools.