CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
M8A3 FILTER UNIT SYSTEM-Continued
WARNING
Remove all jewelry such as rings, dog tags,
bracelets, etc. If jewelry contacts a metal
surface a direct short may result in instant
heating of tools, damage to equipment, and
injury or death to personnel.
NOTE
There are two air purifiers in the M88A1.
Troubleshooting is the same for each.
A
Disconnect wire from M2A2 air purifier. Place red lead
of multimeter in wire and black lead to ground. Turn
MASTER and purifier switches on and check for
voltage. Turn MASTER and purifier switches OFF. If
voltage is present, repair/replace M2A2 air purifier (see
paragraph 14-1). If voltage is not present, go to step B.
B
Reconnect wire to M2A2 air purifier. Disconnect wire
from purifier side of purifier switch. Place red lead of
multimeter on switch terminal and black lead to ground.
Turn MASTER and purifier switches on and check for
voltage. Turn MASTER and purifier switches OFF. If
voltage is present, repair/replace wire (see paragraph
14-1). If voltage is not present, go to step C.
C
Reconnect wire to purifier switch. Disconnect wire from
circuit breaker side of purifier switch. Place red lead of
multimeter in wire and black lead to ground. Turn
MASTER switch on and check for voltage. Turn
MASTER switch OFF. If voltage is present, replace
purifier switch (see paragraph 14-5). If voltage is not
present, go to step D.
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