4-12. UNIT TROUBLESHOOTING (continued).
HOURMETER DOES NOT OPERATE (MODEL A ONLY) (continued).
CAB CONTROL BOX
Electrical power must be shut
off from circuit before continu-
ity can be checked. Failure to
comply with this caution may
result in damage to test equip-
ment or electrical system.
(1) Disconnect main junction box
connector (P4) from main junction
A reading of infinity indicates an
(3) Connect multimeter to leads at
each end of (24-pin) linking
harness, position D. Check
Any reading besides infinity in-
dicates a grounded wire.
end of wire and connect to chassis
MAIN JUNCTION BOX