Recently I was working on my toy and needed a main power fuse holder. I found that this outfit - Blue Sea - has some nifty parts for a heavy duty D.C. wiring job. Check
www.bluesea.com for descriptions - and ebay for decent pricing.
Also found www.kayjayco.com a company that has all sorts of insulation grades of 125°C wire in colors for making a coded harness.
Steve Metzger Tucson, Arizona