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7
STARTING SYSTEM TEST
The starting system consists of 1. the battery or battery bank, 2. the main
cables from the battery to the starter, 3. the magnetic (solenoid) circuit
and 4. the starter. The proper sequence for testing the starting system
is to begin with the battery or battery bank and then once the battery or
battery bank is confirmed to be good and charged then the cables and
magnetic circuit should be tested and finally after the cables have been
confirmed to be good the starter should be tested. If this sequence is not
followed or if the starter is tested with batteries that are low or bad or if
the cables are weak the starter could be misdiagnosed.
Sections 2 and 3 explain the battery and battery bank tests and the next
few sections explain the starting main cable test, the magnetic circuit test
and the starter test.
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#216 12V STARTER
07/05/12 05:45PM
NORMAL DRAW
OIL TEMP: 58F
CURRENT: 640A
CRANK TIME: 1.24S
#217 12 STARTER
07/05/12 05:47PM
NORMAL DRAW
OIL TEMP: 58F
CURRENT: 640A
CRANK TIME: 2.24S
#218 12V STARTER
07/05/12 05:52PM
BEG VOLTS: 12.56
END VOLTS: 9.48
CURRENT: 860A
CRANK TIME: 1.68S
If still out of specifications:
High
Amp reading may indicate engine is out
of time or a faulty starter. Some possible causes are shorted windings,
bent armature, broken housing or bad bearings. Repair or replace
starter as needed.
STARTER DRAW AND DIESEL ENGINES
There are a few points to consider in testing a starter on a diesel engine.
The BVA-2100 is designed to recognize any significant amount of
draw; this includes glow plugs in small diesel engines. In heavy-duty
applications consider computer and accessory draw.
STARTER DRAW TEST (Cont.)
There are 2 results with J1708
Results without J1708
If the results are out of specification do the following:
l
Inspect the connectors for excessive voltage drop.
l
Repair or replace any defective cables or connectors.
l
Retest the system.
l
Make sure you start the engine quickly. The engine should be warm.
l
Turn the ignition on and allow the glow plugs to heat up and click off before
you run the Starter Draw Test. This could be done at the time the Amp Probe is
attached.
l
Repeat the test in different ways and compare results.
