JLG sky trak mmv Service Manual page 529

Before troubleshooting any
electrical circuit, ALWAYS
begin by checking the
following:
1. All connections relating
to circuit are clean and
tight
Model MMV Rev. 12/04
With steer select switch
in 4 wheel steer mode,
only 2 wheel steering
is active.
Check 5.0 amp steer
select fuse.
If OK
Check for battery voltage at
circuit 19B (YEL/BLK) at
steer select valve mounted on
the hydraulic tank. Check
ground connections.
If OK
Replace steer select valve.
Electrical System
Check circuit 19 and 19B
from steer select valve to
Not
OK
steer select switch for open
or short to ground.
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