There are several sites on the web with wire diagrams. Use your search engine. There is a Dutch one I found once that is CAD and in colour and in English. It was easier to follow than the little letters that mean the different colours and was very accurate.
Buy a bunch of "Firewall Grommets" (at least that is what they are called in Canada). Everywhere a wire goes through a hole, a rubber grommet goes. Put a wipe of "Di-electric grease" on EVERY fitting before plugging them together. If Mr. Lucas had discovered this before he got into the wiring business he would be a very famous man (rather than the infamous one he is now.)
Greg S