Perkins 1104E Series Troubleshooting Manual page 122

122
Troubleshooting Section
Illustration 41
D. Measure the voltage on P1 between sockets
P1:56 (UNSWITCHED POSITIVE BATTERY) and
P1:68 (NEGATIVE BATTERY).
E. Measure the voltage on P1 between sockets
P1:57 (UNSWITCHED POSITIVE BATTERY) and
P1:69 (NEGATIVE BATTERY).
F. Measure the voltage on P1 between sockets P1:70
(keyswitch) and P1:68 (NEGATIVE BATTERY).
Refer to Illustration 39.
Expected Result:
The voltage is between 22.0 VDC and 27 VDC for a
24 volt system and between 11.0 VDC and 13.5 VDC
for a 12 volt system when the keyswitch is in the ON
position.
Results:
•
Yes – The ECM is currently receiving the correct
voltage. Proceed to Test Step 4.
•
No – The ECM is not receiving the correct voltage.
Repair: Perform the following diagnostic
procedure:
Troubleshooting, "Electrical Power Supply Circuit -
Test"
STOP.
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