Devenc12

Hey guys, I just recently got my first trials, a 2013 TR280i. The previous owner rigged up a start assist with a 9v battery and when I went to swap for a new battery a few of the wires came apart. I am clueless when it comes to electronics so I have no idea where to even start re wiring. I tried it a couple ways and has had no luck, and now the start assist isn’t working, nor is my fan turning on. If anybody could help me figure this out it would be much appreciated.