All the 2013 900's in this file.

 

Not much in the charging system. The only item not indicated is the flywheel. Circuit from 2011 900xp

 

2013 rzr 4 xp900
So last season the voltage regulator took a shit. 2 diodes open 1 measured 0.5 , sweet replace it.

Next ride, everything all good till we start heading home, I look at the gauge and it says 10v, boogie home as fast as I can before the battery dies and park it for the year.

I'm an idiot and ASSUMED this OE VR shit the bed in one ride so I order one from RMStator for this year. Get it in, same shit.
Test the diodes on the RMStator VR and all 3 test 0.01v (confused, thought 0.5 was what ya wanted to see) plug the other VR back in and test that. All 3 legs 0.5v on the diodes.

Whatever, run the old one keep a spare right? Start it up, I have 14.4v at the battery but the cluster readout says 11.2v and dropping as it runs. At just under 10v it shuts down the EPS and throws a light, but the DMM still showing 14.4v at the battery terminals.

Have cleaned the piss out of the terminals and the ground and still having issues.

If anyone might have access to schematics for these that would be great, even better if you just happen to have seen this before and what the problem was. Thanks guys.

This doesn't sound related to the charging system. I don't know if the ECU is sending the voltage to the gauge cluster via CAN BUS, or if the gauge cluster is reading it directly from it's own power input on terminal 4, but I am going to make the assumption that the ECU sends it via CAN BUS because that would make for a cheaper gauge cluster.

Assuming that, I would check the power and ground coming into the ECU. Pin 253 is battery +, while 250, 251, and 252 are ground. These I see right off the bat from skimming the schematic posted earlier, but you may want to double check to see that I didn't miss anything.

Either way, check this voltage both with the key off, and with it on, as well as with the engine running. You may very well have gotten water in the connector and it is corroding the pins, or maybe a partially broken wire, etc. Often times these things are a poor ground connection somewhere.

If you don't have pins to back probe the ecu harness connector, a paperclip will work in a pinch. Let us know what you find.

 

I would agree if Stator and VR test out good, you are looking for the issue somewhere else. The schematic I posted earlier will help you chase all your possibilities.