CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
POWERPLANT WARNING HORN-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
G Place red lead of multimeter on pin A and black
lead on pin C of horn relay. Check for continuity. If
continuity is present, go to step H. If continuity is
not present, go to step K.
H Place a jumper wire from pin C to socket C. Place
red lead of multimeter on pin B of warning horn
relay and black lead to ground. Turn MASTER
switch on, start engine, set to idle, and check for
voltage. Turn engine and MASTER switch OFF. If
voltage is present, go to step I. If voltage is not
present, replace warning horn relay (see paragraph
6-21).
I Reconnect gage panel to bulkhead wiring harness to
warning horn relay. Disconnect wire 26A from
warning horn. Place red lead of multimeter in wire
26A and black lead to ground. Turn MASTER switch
on, start engine, set to idle, and check for voltage.
Turn engine and MASTER switch OFF. If voltage is
present, go to step J. If voltage is not present,
replace/ repair wire 26A of gage panel to bulkhead
wiring harness (see paragraph 6-45 for dual
voltage; 6-46 for single voltage).
2-216
