Won’t start

You have a very modern Yanmar. You may need to consult the technical manual or display the fault codes and read the ops manual.
 
Doesn’t show any codes
Lets at least start with the basics. This way a low cost or no cost solution would appear.
Power to the ignition system
- When turning the key, does the starter at least go click?
- Is the fuse blown?
- Are the battery cables and posts CLEAN and TIGHT?
- Are the cable wires to the starter CLEAN and TIGHT?
- Your machine may have a solid-state VR. You would need a voltmeter to analysis if the power is being correctly regulated thru it.
- Check the back side of the ignition switch for loose terminals or arcing to ground.
Fuel side
- Are you able to see thru the fuel filter bowl? If so, is there any sludge at the bottom?
- How old is the fuel in the tank? Old fuel tends to go back with diesel eating microbes. Always use FRESH from a very active truck stop.
Air side
- Clean the air filter.
- Clean the radiator screen.
 
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