MTD P90 series Shop Manual page 51

Afterfire solenoid lead from main harness
Figure 4.21
Extended
Figure 4.22
5.
Bench testing the solenoid
To bench test the solenoid:
1.
Ground lead
2.
NOTE: A battery charger set to the trickle charge (2 amp)
3.
Retracted
F
UEL
With the ignition key in the "on" position, test for volt-
age at the power lead connection. See Figure 4.21.
• If battery voltage is present, bench test the sole-
noid.
• If the voltage at the connection is not the same as
the battery voltage or there is no voltage, the prob-
lem is with the equipment's electrical system and
not the solenoid. Follow the troubleshoot proce-
dures found in the appropriate service manual for
that piece of equipment.
Remove the afterfire solenoid by following the proce-
dures described in the afterfire solenoid section of
this chapter.
Connect the ground lead of the solenoid to the nega-
tive side of a 12 volt power supply
setting works fine for this test.
Connect the power lead of the solenoid to the posi-
tive side of the power source while watching the sole-
noid's plunger.
• If the plunger does not retract, the solenoid is
faulty and must be replaced.
• If the plunger does retract, there is most likely an
increased resistance type of failure in the equip-
ment's electrical system. Perform voltage drop
tests to find the source of the resistance.
S G
YSTEM AND OVERNOR
45