I found a pretty good wiring diagram from someone working on a Max26 (seems like he obtained a copy from a tech or official location) and from what I read the smaller MAX engines are actually the same from 24-28 HP. Simply designed to run with different max speeds and maybe different size pumps...but mechanically and electronically they use most of the same engine and electrical components. I though my Max24 acted like it could run a lot higher rpm but they limited it. Now I know why. My max rpm is 2500....the 28hp tractors are 3000. They may have larger a larger fuel pump and injectors?
The wiring diagram I have is pretty good..a few places I can't read the names,,, BUT the bottom of his page had a link on it to Mahindra.
I tried the link and can get to the site page but it requires a dealer or possibly a service technician with a uername and password. So MAHINDRA USA HAS THE DIAGRAMS ON THEIR SERVER BUT WON'T LET THE PUBLIC ACCESS IT. Last Mahindra I buy.
I also read that almost every set of service manuals out their for the Mahindra has wiring diagrams in them that are not useable due to poor resolution...on purpose I assume! Quit a few places also state that their wiring diagrams in the Mahindra service manuals they sell are not useable!