TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
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TM9-2350-311-20-1 M109 VEHICLE TEST CARD — VID 11 ADDITIONAL TEST CONNECTIONS ALTERNATOR TESTS — M109A2/M109A3 NOTE Picture shows conduction-cooled rectifier. Tests also apply to alternator cable in vehicles with fan-tooted rectifier. NOTE Perform the following teats with the alternator cable disconnected as shown. Test 91, stator resistance measured from pin A to B, B to C, and A to C of alternator cable must be less than 5 ohms with engine off. Test 92, stator insulation measured from pin A to ground, B to ground, and C to ground, 9.9.9.9 with engine off. Teat 93, alternator output volts, measured from pin A to B, B to C, and A to C, with engine idling and with 12 Vdc applied to pin D, and with pin E grounded, 30 to 34 Vac at idle. WARNING When performing teat 93, do not run engine above idle with voltage applied on pins D and E. Equipment damage and personal injury may result. NOTE Perform the following teat with the alternator cable connected to the regulator and the current probe positioned as shown. Be sure the probe is 10 in. (25.4 cm) or more away from other wires. Test 90, alternator output current, 30 amps minimum at 1000 to 1200 rpm (accessories on and partially discarged). ALTERNATOR TESTS — M109A4/M109A5 NOTE Perform the following teats with the altenator cable disconnected as shown. Test 91, stator resistance measured from pin B to D, D to F, and B to F of alternator cable must be baa than 5 ohms with engine off. Teat 92, stator insulation measured from pin B to ground, D to ground, and F to ground 9.9.9.9 with engine off. Teat 93, alternator output wits, measured from pin B to D, D to F, and B to F, with engine idling and with 12 Vdc applied to pin A, and with pin C gournded, 30 to 34 Vac at idle. WARNING When performing teat 93, do not run engine above idle with voltage applied on pins D and E. Equipment damage and personal injury may result. NOTE Perform the following teat with the alternator cable connected to the regulator and the currant probe positioned as shown. Be sure the probe is 10 in. (25.4 cm) or more away from other wires. Test 90, alternator output current, 30 amps minimum at 1000 to 1200 rpm (accessories on and partially discarged). NOTE Starting and charging circuits are in Chapter 3 (TM 9-2350-311-20-1). Figure 1, Sheet 2 of 2 I-6