TM 9-2350-230-12
TABLE 8-12. DRIVER'S PERISCOPE WIPER CIRCUITS (FIG. 8-9)
CIRCUIT
TEST POINTS
RESISTANCE
COMPONENT
NUMBER
FROM TO
(ohms)
CIRCUIT
REMARKS
CAUTION: Disconnect battery positive and negative cables before making resistance or continuity tests.
Windshield wiper
31A
P1
P2-C
0
Circuit through cir-
Infinity indicates open
switch feed
cuit breaker to
circuit or defective
panel
lead.
Windshield wiper
521L
P2-C
GND
170-210
Circuit through
Infinity indicates switch
indicator light
switch and light
open or defective lead.
bulb
bulb
Close switch to get indi-
cated resistance. Zero
OHMS with switch
closed indicates short
circuit.
Windshield wiper
P2-C
P3-B
0 OR INF
Circuit through switch
Infinity indicates switch
switch
and panel
"off". Zero OHMS indi-
cates switch "on". Any
in-between resistance
indicates defective
switch.
Windshield wiper
521
P3-B
P8-P9
0
Circuit from panel to
Infinity indicates open
lead
wiper motor feed
circuit or defective
lead.
Windshield wiper
521B
P4
P5-P6
0
Circuit from circuit
Infinity indicates open
parking circuit
P7
breaker to wiper
circuit or defective
lead
motor feed
lead.
Windshield wiper
50
P11-
GND
0
Circuit from wiper
Infinity indicates open
motor grounding
P12
motor to ground
circuit or defective
circuit
P13
lead.
I R. periscope
57
P15
P14
0
Circuit through
Infinity indicates open
feed lead
circuit breaker to
circuit or defective
LR. periscope con-
lead.
nection.
8-61
