TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 456 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

ah. SLAVE START/EXTERNAL POWER

RECEPTACLE CIRCUIT (M109A4/M1O9A5)

The slave start receptacle is located in the driver’s compartment. The external power receptacle is located on the rear

hull bulkhead. When a slave start cable is connected between the slave start receptacles of two vehicles, one vehicle

can power the other vehicle’s electrical system. With the MASTER switch set to ON in the first vehicle and the MASTER

switch set to SLAVE in the second vehicle, 24 Vdc is supplied to the second vehicle’s master relay. This energizes the

master relay circuit which supplies voltage throughout the vehicle’s electrical system.

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