No Load Starter Current Draw Test - Briggs & Stratton 272147 Repair Manual

TM
Vanguard Twin-Cylinder OHV Liquid-Cooled Engine
Section 2 - Troubleshooting
NO LOAD STARTER CURRENT DRAW
TEST
Remove starter motor.
To hold starter securely while testing, clamp starter
mounting bracket in a vise. DO NOT clamp starter
housing in a vise or field windings or magnets may be
damaged.
Testing Starter (No Load)
The No Load starter current draw test will be performed
with the meter in the
300mV
The DC Shunt must be installed on the negative (-)
terminal of the battery, Fig. 11.
ATTACH NEGATIVE
BATTERY CABLE
Fig. 11
1. Attach meter test lead
RED
terminal on shunt.
2. Attach meter test lead
BLACK
terminal on shunt.
position.
to post
RED
to post
BLACK
3. Attach negative battery cable
ground such as drive housing.
4. Attach positive battery cable
terminal on solenoid.
5. Attach one end of jumper wire
terminal, Fig. 11.
6. Activate starter by contacting positive battery
terminal with other end of jumper wire
a. Allow 3 seconds for meter reading to stabilize.
7. Current draw should not exceed 50 amps DC.
If amperage draw exceeds specification, replace
starter.
Hard Starting
Make sure the oil level is correct.
This engine is equipped with a "Low Oil Pressure
Sensor" and will not start if the oil level is too low.
Make sure drive unit is disengaged.
A loose drive belt like a loose blade can cause a
backlash effect, which will counteract engine cranking
effort.
NOTE
: Magnetron® ignition system requires a
minimum of 350 RPM before it will produce a
spark.
Systematic Check
If the engine is hard starting or will not start and the
cause of malfunction is not readily apparent, perform a
systematic check in the following order:
1. Ignition
2. Carburetion
3. Compression
This check-up, performed in a systematic manner, can
usually be done in a matter of minutes. It is the quickest
and surest method of determining the cause of failure.
to a good
to battery
to solenoid tab
, Fig. 11.
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