Hi i'm working on a 07trx420fm ,they replaced the wiring harness. the ranchhand wasn't sure why. it blows the ign fuse when i plug the relay or the bank sensor in & it has no spark or power to the fuel pump i bypassed the bank sensor & got it to stop blowing the fuse but still have the other problems thanks for any help

 

Wow. Who replaced the wiring harness, and can you find out why?

With it having been messed with that much, there's really no way to tell what could be hooked up wrong, shorted, or otherwise messed up without being able to lay hands on it.