TB 9-2320-360-13&P-1
WARN I N G
Jewelry can catch on equipment and cause injury or short across electrical circuit and cause severe
burns or electrical shock. Remove rings, bracelets, watches, necklaces, and any other jewelry before
working around HET Tractor.
A/C circuit breaker, A/C relay, and 24 vdc magnetic switch (R22) are always electrically hot and can
cause severe injury to personnel. Care must be exercised when working around these components.
VOLTAGE TEST
(1) Remove A/C switch harness connector
from A/C control switch.
(2) Turn engine switch to ON position
(TM 9-2320-360-10).
(3) Place positive (+) probe of multimeter
on orange wire from A/C relay, at A/C
switch harness connector.
(4) Place negative (-) probe of multimeter
on ground.
(a) If 22 to 28 vdc are not measured,
turn engine switch to OFF position
and go to work package 0015 00
(A/C does not operate).
(b) If 22 to 28 vdc are measured, turn
engine switch to OFF position and
go to Step 15 of this fault.
CONTINUITY TEST
(1) Remove two screws and doghouse
cover (WP 0028 00).
(2) Disconnect A/C switch harness
evaporator connector.
(3) Remove electronic control box
assembly cover (TM 9-2320-360-20).
(4) Set multimeter switch to ohms.
(5) Is there continuity measured on black
wire between A/C evaporator
connector and 24 vdc magnetic switch
(R22)?
(a) If there is no continuity, repair A/C
switch harness black wire (See WP
0057 00, Fig j). Verify repair, go to
Step 18 of this fault.
(b) If there is continuity, go to Step 16
of this fault.
HETF00223
0016 00-17
