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Message: <blockquote data-quote="Mike10" data-source="post: 55788" data-attributes="member: 5461"><p>Took a look at the wiring diagram.  My memory is not as good as it used to be.  Since it starts in the service position the aux switch must be working ok.  If you checked the fuses in the cab fuse panel, the two 7.5A fuses and they were good, then you need to go to the engine compartment fues panel.  Under the cover of this panel are some relays and a diode.  The diode looks like a regular two terminal connector without any wires coming out of the one end.  Unplug the diode and check if you have power to the diode, if power then remove the fuel relay, this should be the one with the orange wire going to it.  Two of the terminals in the base should have power when the key is in the one position.  The orange wire gets its power from the cab fuse panel.  One of the white wires gets it power through the diode.  If you have no power at one of the white wires, then the diode is bad.  If you have a volt meter that checks diode, then you can check the diode this way.</p></blockquote><p></p>