TM 5-3805-262-20
TESTING
NOTE
T e s t i n g c o n s i s t s o f o p e r a t i n g c a b u p p e r w i r i n g h a r n e s s a c c e s s o r y c i r-
cuits as shown in figure FO-3. The wiring harness is okay if accessories
operate normally. If necessary, you may test individual wires for conti-
nuity by energizing the corresponding accessory circuit shown in figure
F O - 3 a n d c h e c k i n g f o r v o l t a g e u s i n g m u l t i m e t e r o r t e s t l i g h t . T o t e st
f o r s h o r t e d o r g r o u n d e d w i r e , y o u m u s t d i s c o n n e c t b o t h e n d s o f w i re
under test as follows.
(1)
( 2)
( 3)
(4)
(5)
(6)
(7)
( 8)
(9)
At cab switch panel, tag and disconnect cab upper wiring harness termi-
nals (page 10-48).
At top of cab, at defroster fans, tag and disconnect cab upper wiring
harness terminals (page 10-62).
Disconnect cab upper wiring harness terminal from dome light (page
10-68).
Tag and disconnect cab upper wiring harness terminals from defogger (page
10-52).
At cab wall, grasp cab console wiring harness connector with fingers, pry
open tabs at top and bottom of connector, and firmly pull connector from
cab upper wiring harness connector.
If necessary for repair, squeeze tabs at sides of cab upper wiring har-
ness connector and push connector from cab wall.
Connect multimeter between ends of wire under test and check multimeter
f o r c o n t i n u i t y i n d i c a t i o n.
If multimeter does not indicate continuity,
repair wire or connector.
Connect multimeter between either end of wire under test and good vehicle
ground. Check multimeter for no continuity (open circuit) indication. If
multimeter indicates continuity, repair chafed or cut wire insulation.
Identify harness wires adjacent to wire under test. Connect multimeter
between either end of wire under test and each adjacent wire. Check mul-
t i m e t e r f o r n o c o n t i n u i t y ( o p e n c i r c u i t ) i n d i c a t i o n f o r e a c h t e s t . If
multimeter indicates continuity, repair chafed or cut wire insulation.
5-183
