TROUBLESHOOTING 777 SERVICE MANUAL
10-32 Published 10-01-2012, Control # 045-08
Test 4 – Checking Resistance at Engine Oil Pressure Sender
To test the 12 VDC starting batteries connected in series for
24 volts using a digital multimeter, record the voltage before
and during cranking. A voltage reading of 24 volts or less
before cranking may indicate a charging system fault. A
drop of 8 volts or more during cranking indicates a failing
battery.
Item Description
1 Oil pressure sender
2 Negative probe
3 Positive probe
3
1
AA304
2
FIGURE 10-6
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