first have a look at your battery leads one of them will be connected directly to the engine or Chassis, normaly the negative terminal. with battery disconnectedthis will be your earth point, get someone to help if possible and hold one meter lead firmly on the lead, set meter to lowest Ohms range and press other probe onto the engine somewhere, you should get a low reading, Idealy less than 1 ohm, you may have to use the point of the meter probe quite firmly to get through any gunk, once you have confirmed what that low reading is, anything more than a couple of ohms and you dont have a very good connection, you can repeat between the battery lead and each side of the fuse holder (with fuse removed) if you get a low reading, again less than a couple of ohms on one side or the other then you probably have a short to earth somewhere, if both sides are greater than say 10 ohms the wiring is probably ok,
BTW you said that some of the fuse sockets were 0 ohms, was this with fuse in or out, I would be a bit concerned if you are getting 0 ohms accross a fuse holder with fuse removed
Tim
Edited by - tbird on 21 Jun 2009 18:44:24