2-176Change 4TM 9-2250-267-20G Place red lead of multimeter on heat selector switch (output wire 402) andblack lead to ground Move HEAT SELECTOR switch to HIGH and LOWpositions (position red leaden HIGH and LOW terminals). If voltage is notpresent in both positions, replace switch (p 6-26). If voltage is present goto step H.HAssemble and install accessory control box (p 6-26). Disconnect wire 402Aat personnel heater fuel pump. Place MASTER switch ON, HEATSELECTOR switch LOW. Place red lead of multimeter in wire 402Aconnector and black lead to ground If voltage is not present replace wire402A (p 6-100.3). If voltage is present, replace fuel pump (p 14-71). Ifheater still does not operate, replace heater (p 14-68.2).
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