main lessons learned....
1- relays : NEVER EVER EVER does a relays switch go directly to earth (kinda dumb, but i did actually do that)
2- lights : ALL lights are wired to have the positive direct to them and the negative where the switch that turns them on is
3- ground : Ground (negative battery) should connect to all three, Engine, Chassis and Body...leaving any of them out causes either things NOT working, overheating or very poor or flickering function.
4- earthing : whenever an earth wire is required, make sure it can handle EVERYTHING that uses that earth. E.g. Headlights require an earth wire capable of handling tail switch, headlights and Beam lights. not having them on does NOT mean reduce the earth wire gauge size.
5- wire length : to get the most out of your wires, set them up as if they were connected (use duct tape to temporarily secure them along their paths. then ADD an inch or two for stripping, crimping or just simple errors.
6- labeling : if ur like me and cant get the actual wire colours, use a colour code you understand...and STICK to it....then add small labels at BOTH ends of the wire indicating where they come from or go to...also stick to that method.
7- DONT wrap your wires until you complete the WHOLE testing....believe me....i learned this the hard way....almost 10 rolls of electrical tape later....when i did finally complete the main and interior, i ended up only using about 3.
hope this helps