TM 5-3805-254-20-1
ELECTRICAL SYSTEM - CONTINUED
PTO (POWER TAKE OFF) INDICATOR LAMP SWITCH
Current supplied through KEY SWITCH when turned on. Air pressure entering pto control when engaging, pushes in on
pin in switch. This connects contact points and completes circuit to illuminate indicator lamp.
COMPRESSION BRAKE PRESSURE SWITCH
Current supplied through COMPRESSION BRAKE-JACOBS ENGINE BRAKE/OFF switch. Circuit completion is
accomplished by maintaining specified transmission oil pressure. Reduced transmission oil pressure at idle or when
transmission is in neutral, opens circuit and disengages compression brake.
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