very weak spark

Points are breaking on each lobe and shaft was not lose. I did check that last night. If the relay doesnt play a part it would have to Almost be a switch I would think. I do know I have no fuse block power. Will also need to check connections in main harness connections at firewall. The fuseable link was good as well going to that block. Thanks for help so far. Where can I get a wiring diagram. I would rather test then guess!
Rodney