4-12. UNIT TROUBLESHOOTING (continued).
10. NO TRANSIT LIGHT DOES NOT OPERATE PROPERLY (MODEL A ONLY)
CAB CONTROL BOX
Electrical power must be shut off
be checked. Failure to comply
with this caution may result in dam-
age to test equipment or electrical
(1) Disconnect main junction box
connector (P4) from junction box.
(2) Set multimeter to ohms position.
A reading of infinity indicates an
(3) Connect multimeter to leads at each
end of (24-pin) linking harness, and
special attention to harness positions
N, K and Q.
Any reading besides infinity
indicates a grounded wire.
of wire and connect to chassis
MAIN JUNCTION BOX