ELECTRICAL TROUBLESHOOTING
SECTION 4 Main Sequence PAGE 18
Connect a voltmeter across the ISO solenoid
COLD terminal and battery negative.
Close all interlock switches and turn the
Key Switch ON.
Depress the accelerator pedal fully.
•
If the voltage is at battery volts then
the wire from the ISO solenoid to the
PMC is bad. Stop trouble shooting
here and repair the problem. When
the repair is completed, completely
retest the vehicle before lowering the
drive wheels to the ground.
Connect a voltmeter across the ISO solenoid
HOT terminal and battery negative.
Close all interlock switches and turn the
Key Switch ON.
Depress the accelerator pedal fully.
•
If the voltage is at battery volts then the
ISO solenoid has failed. Stop trouble
shooting here and repair the problem.
When the repair is completed,
completely retest the vehicle before
lowering the drive wheels to the ground.
•
If the voltage is not at battery volts then
check the wiring to battery positive and
the main circuit breaker. Stop trouble
shooting here and repair the problem.
When the repair is completed, completely retest the vehicle before lowering the drive
wheels to the ground.
Forward (does not run in reverse)
Connect a voltmeter across the PMC KSI
terminal and battery negative.
Close all interlock switches, turn the
Key Switch ON, and place the F&R
Switch in reverse.
•
If the voltage is not at battery volts
then go to the
Key Switch
sequence.
FLUKE 79
SERIES II MULTIMETER
V
V
OFF
Hz
mV
A
Solenoids are shown for reference only.
The type of solenoid in your truck may
look different
ISO
_
+
The voltage shown is for illustration
only. The actual voltage may vary.
Battery Negative
FWD/REV
FLUKE 79
SERIES II MULTIMETER
V
V
OFF
Hz
mV
A
Solenoids are shown for reference only.
The type of solenoid in your truck may
look different
ISO
_
+
The voltage shown is for illustration
only. The actual voltage may vary.
Battery Negative
FWD/REV
Main Battery Negative
B-
M-
A2
B+
#2
KSI
_
+
The voltage shown is for illustration
only. The actual voltage may vary.
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