5-7
Figure 5-3. Electric Starting System Diagnosis
STARTER STALLS OR
SPINS TOO SLOWLY
Perform voltage drop tests
from battery to solenoid,
solenoid to motor, battery
ground to motor ground
Starter motor current
draw test (on vehicle)
Starter motor
free draw (bench test)
Test starter
motor for
opens, shorts
or grounds
Inspect
engine,
primary
drive
Does starter motor
turn if jumped?
YES NO
Perform
solenoid
hold-in &
pull-in tests
Test starter
motor for
opens, shorts
or grounds
BATTERY TESTS
• Visual • Voltage
Check connections at battery
and starter components
RUN-ON
Sticky
starter
button
Contaminated
switch (water
in button)
Sticking
relay
STARTER SPINS, BUT
DOES NOT ENGAGE
Starter clutch
failure. Replace
starter clutch
Damaged gear &
armature.
Replace starter
INOPERATIVE
Nothing clicks Relay clicks Solenoid clicks
Perform voltage drop
tests between battery
and solenoid relay ter-
minals (less than 1 volt)
High voltage
YES
Back track to pinpoint
connections or switch
problems
Test wiring to
relay and
solenoid
Test solenoid
Test starter
motor
Correct
relay
ground
Test relay
NO
Check for
power at relay
from button
NO YES
Check
for
power
at button
Check
for
ground
at relay
NO YES NO
Check
for
power to
button
Substitute
good relay
NO
YES
Repair wiring
Replace switch assembly
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