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NOTE: Repeat this test when the engine is thoroughly
warmed up. Heat expansion of metal may cause voltage
drop to increase.
3. Battery Ground to Starter Solenoid (+) Voltage
Drop Test
This test checks for battery power efficiency to the
starter solenoid. Measure the voltage drop between
the battery post and the connecting cable, the
solenoid post (+) and the wire that attach to it.
To measure voltage drop:
- Set the rotary switch to voltage ( ).
- Touch the Black test probe to the negative (-) battery
post and the Red test probe to the positive (+); this
reading will be the base voltage to compare your
test voltage reading against.
Connect:
- Black test probe direct to the positive (+) terminal on
the starter solenoid.e.
- Red test probe to the positive (+) battery post.
Set:
- RECORD (MAX-MIN-AVG) function on the Meter.
Disable the ignition so the engine doesn’t start and
crank the engine for 4 ~5 seconds.
This connection has 2 connectors and 1 wire so a
voltage drop of more than 300 mV would indicate a
poor circuit.
Test again after cleaning and inspecting the battery
cable connections and the Ground.
NOTE: Repeat this test when the engine is thoroughly
warmed up. Heat expansion of metal may cause voltage
drop to increase.
4. Battery Ground to Complete Starter Circuit (+)
Voltage Drop Test
This test checks for battery power efficiency to the
starter motor system including the starter solenoid.
Check the resistance in the starter circuit. Even very
low resistance in the starter circuit can cause the
starter to turn slowly, because of low voltage.
To check voltage drop:
- Set the rotary switch to voltage ( ).
- Touch the Black test probe to the negative (-) battery
post and the Red test probe to the positive (+)
battery post to establish the base voltage that you
will compare against test voltage.
Summary of Contents for UD88
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