Where is the battery and fuse box on a cbr125?

It sounds like a fuse has blown when the bike fell.

The fuse box should be located either under the tank or under the seat near the battery (normally a black box about the size of a cigarette pack.

Failing that, I would check the connections to the back of the speedo panel.

You have to remember most of these cables are plugged in, so a sufficient whack from the fall could loosen the connections.

Check your fuseable links on the positive battery clamp and in the fuse box next to the battery

1st step is check fuses. there's often a separate fuse on the starter relay. then check connections to battery. earth especially from frame or engine to battery.let me know how you get on

check you alternator diode or you change the alternator complete

Battery & fuel overflow pipes!

Voltage issue. With the bike running, remove the negative terminal off of the battery. If the bike stops, it's the alternator. If it doesn't, have the battery tested. Possibly dead cells in the battery. If that still doesn't work, let me know the model year and we can go from there...

for early production models
bjb (battery junction box) fuse #6
cjb (central junction box) fuse #17

for late production models
bjb (battery junction box) fuse #6
bjb (battery junction box) fuse #47
bjb (battery junction box) fuse #2
cjb (central junction box) fuse #17

Usually the CDI. If you have meet the requirements to operate the bike without the restrictions, then the dealer would be glad to change out the CDI, etc. It is not that costly.
Then you can see the benefits from changing pipes, sprokets, etc.
Hope this helps,

JP

maybe its just a guess that your front tire is throwing a lot of water up inside the engine near the exhaust collector or something.