Dfi manuals My 2012 Kawasaki Mule has the DFI light illuminated and has low power?

Question moved from Cars and Trucks.

Wiring diagrams in the link.

https://www.google.com/search?q=kawasaki+mule+fxt+le+fuse+box+diagram

..

Something is shorting to earth on the brake lights.

Get a pack of fuses.

Remove left side bulb. Brake, does is blow the fuse?
Remove right side bulb. Brake, does it blow the fuse?
If yes to the above, it is the light fitting or wiring rubbed through to that light.

If no, it is the switch or wiring to the switch on the brake pedal.

https://www.google.com/search?q=4010+4x4+diesel+mule+blows+fuse

..

I assume there is only ONE fuse, since you are not specific.
The solution therefore is just hard work and long hours with your ohmmeter disconnecting wires and tracking it down one wire at a time.

https://www.manualslib.com/manual/803081/Kawasaki-Mule-4010-Trans-4x4.html?page=37
You did not say what model you have
https://www.kawasakimotorcycle.org/forum/kawasaki-atv-mule/152674-2012-diesel-mule-4010-no-power-steering.html
https://www.kawasakiforums.com/forum/general-tech-9/kawasaki-mule-3010-trans-4x4-640/

i would return the mule to the dealer where you bought it,and let the warranty pay for the battery and testing,etc.

Billy, probably burnt belt.Check the attached links,Manuals and guides, Good luck with your Bike
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

ATV Service and Repair Manuals
Service Manuals for Download in PDF
ATV TROUBLESHOOTING AND MAINTENANCE

More than likely you have either a bad coil or the rocker arm has slipped off. Pull each plug, Check plug. If 1 is fouled, that cylinder is where the problem is. Check for spark on each cylinder, If one has no spark, replace the coil (there are 2). Replace only the bad one. Before replacing the coil, check for compression, if on is real low, pull off the rocker cover and check for valve action.

16.5 foot pounds

First is the engine Diesel or Gas?
if it is a diesel engine it has almost got to be a compression or fuel problem if it is a Gas engine it can be a valve adjustment, fuel, compression, or spark problem