Then you should rule out that by doing the following:
1. Swap the two big relays at the bottom of the interior fusebox and check fuses F14 and F24 there
2. Swap relays R9(main) with R8(heated screen) in the engine bay fusebox and check fuses F1 and F2 there
IMO if the problem was the battery lead it should have not cranked in the first place

