Looking at JDparts, it looks like the wiring for the 5X00 and the 5X10 is about the same. I had a problem with my 5210 that the dash lights did not always work. I replaced the diode pack (for the 5x00 it is part number RE262484, $17.08 from greenfarmparts) and the dash lights worked. The diode pack is located under the left cowl and is the front little box. The diode pack is also used for the headlights both high and low. This statement was taken from my tech manual - Diode pack also blocks current flow from feeding back across one headlight circuit to the other.
I have attached a wiring diagram for 5X10, you will need to determine how close the two are.
The diode pack has several diodes in it for various 5X10 electrical functions, those being starting system and light system (headlights and dash lights).
You may want to get the tech manuals at selectmanuals.com $19.95.