TM 5-3805-262-20
TESTING
NOTE
Testing consists of operating cab lower wiring harness circuits as shown
i n f i g u r e F O - 3 . T h e w i r i n g h a r n e s s i s o k a y i f c i r c u i t s f u n c t i o n
normally. If necessary, you may test individual wires for continuity by
energizing the corresponding circuit shown in figure FO-3 and checking
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 s t f o r s h o r t e d or
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 r e u n d e r t e s t as
f o l l o w s .
(1)
(2)
( 3)
(4)
(5)
Beneath cab, unplug front wiring harness connector from cab lower wiring
harness connector by grasping both with fingers and pulling firmly apart.
In cab, below cab switch panel, tag and disconnect wiring harness termi-
nals by grasping with fingers and pulling firmly.
Identify wire under test using electrical wiring diagram, figure FO-3,
connect multimeter between ends of wire, and check multimeter for conti-
n u i t y i n d i c a t i o n . I f m u l t i m e t e r d o e s n o t i n d i c a t e c o n t i n u i t y , r e p a i r
w i r e , c o n n e c t o r , o r t e r m i n a l .
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.
5-187
