The light not coming on is very different than not having a light. When you say no light, I think you are meaning that you do not have one.
It is little details like this that make all the difference.
Remember, I can not see or hear what is going on, so I only know as much - or as little - as you tell me.
You stated that all 3 fuses have 12.5V, but you did not specify how you tested them.
If you did not, you need to pull the fuses and actually test them with a meter for continuity. The fuses can blow where you can not see it.
If you find a fuse blown, replace it.
If you do not find a bad fuse, disconnect the remote connector (the black or gray 8-pin connector located at the rear left corner of the genset, or if our genset is mounted in the front of your coach, it will be the front left corner), and try starting at the genset.
If it cranks with the remote disconnected, you have a short in the remote harness.
If it still will not crank, you will need to remove the top and/or front panels of the genset to access the controller.
Unplug the large connector from the controller, and locate the wires P1-8 and P1-7.
Test P1-8 (very carefully so you don't damage the pins), for 12V. It should be present.
If it is not, you have a broken wire between the fuse and the connector.
If you have good 12V to P1-8, test P1-7 for continuity to ground. It should show continuity.
If it does not, you have a broken wire between the connector and ground,
If you have good 12V at P1-8, and good ground at P1-7, then you have a bad controller.