67-72 Chevy Electrical Help

I'm looking for an Electrical schematic for a 70 K-5 Blazer. I think 70-72 were all the same, and the pickups shouldn't be that different either. I've got to sort some ignition problems out but the previous owner butchered my harness and I need a starting pont. Any help would be appreciated.

Oh yeah, I already have the Chilton's manual, it doesn't have a damn thing in it.