Morning! New to the forum...in fact I'm new to electric bikes. I own a small bike shop and a customer brought in his X-treme XB-502 (as best I can tell that's the model it has 4 12v12aH batteries) and the fuse blows. I started working on it by inserting a new fuse (key OFF) and it violently blew the fuse. Upon a great bit of troubleshooting and wire chasing, etc. when I unplug the yellow wire from the controller to the hub it won't blow the fuse. As soon as I attempt to plug in the yellow wire, it gives a nice light show when blowing the fuse.
I hit the yellow wire with my VOM and I have 48volts (and apparently a fair bit of amps :). So, my questions are these:
1) Should I have 48v on the yellow wire out of the controller with the key off?
2) Anyone have a good set of wiring diagrams and troubleshooting tables?
Thanks so much in advance, looking forward to working more and more on these bikes!