Fuse And Relay Replacement - JLG sky trak mmv Service Manual

General Information, Specifications and Maintenance
2.13.18

Fuse and Relay Replacement

IMPORTANT: Shut off the engine and follow the battery
disconnect procedure below, before checking the electri-
cal system. Use an ohmmeter to check the resistance of
wires and components.
a. Disconnect Batteries
1. Remove engine side battery box cover (1). Remove
wing nuts (2) and carriage bolts (3) and set cover
and mounting hardware aside for later re-assembly.
2. Disconnect the negative (-) battery cable (4) at the
battery negative (-) terminal on the battery in the
engine side battery box.
3. Disconnect the negative (-) cable (5) at the bottom of
the battery equalizer (6).
2
1
3
Fuses and relays help to protect the electrical system. In
general, a failed fuse is symptomatic of another electrical
problem. Simply replacing the fuse often will not solve the
problem. Failed fuses usually are due to simple causes,
including loose or corroded connections, or a defective
relay.
The main causes of failed fuses include a shorted or
grounded wire in the applicable circuit, or a defective
electrical component. Visually check the condition of the
fuse, wires, connections and components in the involved
circuit before replacing a fuse. Check the circuit for
shorts, grounding or defective electrical components.
b. Fuses and Relay (Fuse Block)
The fuses and relays in this vehicle protect the electrical
system. The fuse and relay block is mounted under the
lower left side of the operators dash panel (7). To gain
access, remove the three screws that secure the lower
dash panel (8) in place. Refer to the following chart for the
locations of fuses and relays within the fuse block (9).
2.56
6
5
4
MM2911
7
8
OS10932
9
MM3230
Model MMV Rev. 12/04