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CHASSIS ELECTRICAL TROUBLESHOOTING - Continued
CHASSIS ELECTRICAL TROUBLESHOOTING - Continued

Maintenance and Parts Manual For MT3 Standard Aircraft Towing System \(SATS\)
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0011
TM 1-1740-221-13&P&P
CHASSIS ELECTRICAL TROUBLESHOOTING - (CONTINUED)
BRANCH 2.
2.
Ignition switch and headlight switch on, test for 12 volts at wire 96 and wire 101 at the headlight switch
(WP 0122).
CONDITION/INDICATION
Does switch have 12 volts output?
DECISION
YES Proceed to Step 3.
NO Replace headlight switch (WP 0122) or repair circuit wiring (FO-1 line 53).
BRANCH 3.
3.
Ignition switch and headlight switch on, check for 12 volts at wire 97 (dimmer switch in low beam position) and
wire 98 (dimmer switch in the high beam position) at the dimmer switch SW4 (WP 0114).
CONDITION/INDICATION
Is voltage check satisfactory?
DECISION
YES Proceed to Step 4.
NO Replace headlight dimmer switch SW4 (WP 0114) or repair circuit wiring (FO-1, line 53).
BRANCH 4.
4.
Test for 12 volts at both headlight connectors with ignition switch on and headlight switch on (WP 0122).
CONDITION/INDICATION
Do both headlight connectors have 12 volts?
DECISION
YES YES - Replace both headlight bulbs (WP 0113).
NO Proceed to Step 5.
MALFUNCTION - BRANCH 5.
MALFUNCTION - Both connectors do not have 12 volts.
ACTION
5.  Repair defective circuit wiring (FO-1, line 53).
00113


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