TM-5-3805-254-14-P-2

TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)

JUNE 1980

TM-5-3805-254-14-P-2 - Page 262 of 894

TRUCK SERVICE MANUAL

ELECTRICAL

1.

Make connections as shown in Fig.

12, except leave

the carbon pile disconnected.

IMPORTANT: Ground

polarity of energizer or battery and generator must

be the same.

Use a fully charged battery and a 10

ohm resistor rated at six watts or more between the

generator No.

1 terminal and the battery.

Fig.

12

Connections for Bench Check of

Alternator

2.

Slowly increase the generator speed and observe

the voltage.

3.

If the voltage is uncontrolled with speed and

increases above 15.5 volts on a 12volt system,

check for a grounded brush lead clip as covered

under "Overcharged Battery, " Step 3.

If not

grounded, replace the regulator and check field

winding.

4.

If voltage is below 15.5 volts on a 12-volt system,

connect the carbon pile as shown.

5.

Operate the generator at moderate speed as

required and adjust the carbon pile as required to

obtain maximum current output.

6.

If output is within 10 percent of rated output as

stamped on generator frame, generator is good.

7.

If output is not within 10 percent of rated output,

keep battery loaded with carbon pile and ground

generator field, Fig.

5.

8.

Operate generator at moderate speed and adjust

carbon pile as required to obtain maximum output.

9.

If output is within 10 percent of rated output, replace

regulator as covered under "Brush Holder and

Regulator Replacement" and check field winding.

10. If output is not within 10 percent of rated output,

check the field winding, diode trio, rectifier bridge

and stator as previously cove red.

258