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Message: <blockquote data-quote="Mike10" data-source="post: 49881" data-attributes="member: 5461">On the large frame loaders there is a switch on the control valve aux spool.  This switch keeps hyd driven implements from starting inadvertantly when the engine is started in the case the aux hyd control lever was not returned to neutral when the engine was last stopped.If the lever is not in neutral the engine will crank but not start.  There are two sources of power to the fuel shut off solenoid.  One goes through the control valve switch.  If the aux is in neutal the engine will start.  If you get out of the seat with the aux engaged the engine will stop because no power is going to the fuel shut off solenoid.  There is a switch on the instrument panel for aux over ride.  Pressing this switch allows you to exit the seat, in the case of a backhoe, without shutting the engine down.  This is the second source of power to the fuel solenoid. The source of this second circuit originates at the engine fuse panel 25A fuse.  This fuse sends power to the run relay.  If the diode is good, the one mentioned by earthworks, the relay is energized and power is sent to the 15A fuse in the cab fuse panel.  From there the power goes to the instrument panel and the panel sends power to the fuel solenoid when the aux lever is moved from neutral.</blockquote>