Lull 944E-42 Service Manual - Manual (Page 209)

9-51 944E-42
Electrical System
Measuring Voltage Drop
The following test determines the difference in voltage
potential between two points.
1. Set the rotary dial of the DMM to the V (DC) position.
2. Connect the (+) positive lead (1) of the DMM to one
point of the circuit to be tested.
3. Connect the (-) negative lead (2) of the DMM to the
other point of the circuit.
4. Operate the circuit.
5. The DMM displays the difference in voltage between
the two points.
Testing for Continuity
The following procedures verify good continuity in a
circuit.
With a DMM
1. Set the rotary dial of the DMM to the Ohm position.
2. Disconnect the power feed (i.e. fuse, control module)
from the suspect circuit.
3. Disconnect the load.
4. Press the MIN MAX button on the DMM.
5. Connect one lead of the DMM to one end of the
circuit to be tested.
6. Connect the other lead of the DMM to the other end
of the circuit.
7. If the DMM displays low or no resistance and a tone
is heard, the circuit has good continuity.
With a Test Lamp
Note: Only use the test lamp procedure on low
impedance power and ground circuits.
1. Remove the power feed (i.e. fuse, control module)
from the suspect circuit.
2. Disconnect the load.
3. Connect one lead of the test lamp to one end of the
circuit to be tested.
4. Connect the other lead of the test lamp to battery
positive voltage.
5. Connect the other end of the circuit to ground.
6. If the test lamp illuminates (full intensity), then the
circuit has good continuity.
(POWER ON AT ALL TIMES)
(+)
(-) DMM
SOLENOID
BLK
RED
SWITCH
FUSE
BLOCK
MT0411
1
2