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FIGURE 2-7. SIMPLIFIED SOLENOID CIRCUIT
SOLENOID CHECKS
A basic solenoid circuit is shown in Figure 2-7. Sole-
noids can be checked electrically using the following
procedure.
Test
1. With all leads disconnected from the solenoid,
make test connections as shown to the sole-
noid, switch terminal and to the second switch
terminal "G", to check the hold-in winding (Fig-
ure 2-8).
2. Use the carbon pile to decrease the battery volt-
age to 20 volts. Close the switch and read cur-
rent.
The ammeter should read 6.8 amps
maximum.
3. To check the pull-in winding, connect from the
solenoid switch terminal "S" to the solenoid
motor "M" or "MTR" terminal (Figure 2-9).
To prevent overheating, do not leave the pull-in
winding energized more than 15 seconds. The
current draw will decrease as the winding tem-
perature increases.
4. Use the carbon pile to decrease the battery volt-
age to 5 volts. Close the switch and read cur-
rent.
The ammeter should read 9.0 to 11.5
amps.
NOTE: High readings indicate a shorted winding.
Low readings indicate excessive resistance.
D02034
5. To check for grounds, move battery lead from
"G" (Figure 2-8) and from "MTR" (Figure 2-9) to
the solenoid case. Ammeter should read zero. If
not, the winding is grounded.
FIGURE 2-8. SOLENOID HOLD-IN WINDING TEST
FIGURE 2-9. SOLENOID PULL-IN WINDING
24 VDC Electric Supply System
TEST
D2-17
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