You could probably find a used switch and wiring for it on ebay. That might be the first thing to do. Bring it back to stock and then go from there. Of course, you can troubleshoot it as is if you want to keep it in the altered state, but that makes it difficult for anyone else to help without being there.
I have scanned all the electrical test procedures if you need them??? just PM me with your email address and I will be more than happy to send them to you along with anything else in the manual you need.