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Electrical Cont.
Electrical Diagnostic Steps
1. See Battery Removal steps #1-4 to disconnect the battery.
2. Locate the specific fuse or relay controlling the component that is non-operational.
3. Remove fuse or relay and verify if functional. Note: In remote locations where it’s not possible to check for a bad
relay or blown fuse with multimeter, simply replace the fuse or relay.
A. If functional: Move to step #4.
B. If not functional: Move to step #5.
4. With the newly replaced fuse or relay, attempt to use the previously non-operational component.
A. If functional: You are finished. The system was most likely overworking and pulled too many amps which blew
the fuse, or the fuse/relay simply went bad.
B. If not functional: Move to step #5.
5. Trace all the wires connected to the fuse or relay, and component that is non-operational. A wire may be pinched,
cut apart, pulled out of a connector, insulation worn through, or even a loose connection. If this is the case, fix
immediately. Replace the corresponding fuse. Note: When replacing wire, always maintain Mudd-Ox specifica-
tions. Do not change gauge of wire, install additional connectors, or change routing of wire. If this solution did not
fix the problem, move to next step.
6. If wires appear to be in good condition, the non-operational component itself may need replaced. Replace it
along with any fuse or relay.
7. Reverse Battery Removal steps #1-4 to reconnect the battery.
Locations
Following pages show each fuse, relay, sensor and contactor location visualized for the Mudd-Ox chassis. Engine
electrical systems are explained in the engine owner’s manual.
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