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１２
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[3] Battery Power to Starter Solenoid (+)
This test checks battery source efficiency to the starter solenoid .
·
Set the rotary switch to
Voltage .
·
Establish the base voltage that you will compare test voltage against (see
base voltage , Volt Drop Test [1] ).
·
Connect the positive (+) lead to the positive (+) battery terminal.
·
Connect the negative (-) lead to the positive (+) terminal on the starter
solenoid .
·
Disable the ignition so the engine doesn
’t start ; crank the engine for 2-3
seconds .
The example shown has 2 connectors and 1 wire , A voltage drop of more than
0.3 volts would indicate a poor ground circuit .
Clean and inspect the battery cables and cable connections ; test again .
Important
:Repeat this test when the engine is thoroughly warmed up .Heat
expansion of metal may cause resistance to increase .
[4] Battery Power to Complete Starter Circuit (+)
This test checks battery power efficiency to the starter through the starter
solenoid .
·
Set the rotary switch to
Voltage .
·
Establish the base voltage that you will compare test voltage against (see
base voltage, Volt Drop Test [1] ).
·
Connect the positive (+) lead to the positive (+) battery terminal .
·
Connect the negative (-) lead the positive (+) terminal on the starter motor .
·
Disable the ignition so the engine doesn
’t start ; crank the engine for 2-3
seconds.
The example shown has 4 connectors and 2 wire , and 2 solenoid
connections .A voltage drop of more than 0.8 volts would indicate a poor ground
circuit .
Clean and inspect the battery and starter cables , solenoid and cable
connections ; test again.
Note :
A defective starter solenoid may cause an excessive voltage drop ;
check the cables and connections before replacing the solenoid .
Starter Motor Testing
[1] Starter
– Current
The battery tests and the voltage drop tests have verified that there is adequate
battery voltage at the starter . Next , check for excessive starter motor current
draw.
·
Connect a current clamp around the negative (-) or positive (+) battery cable .
·
Set the rotary switch to the
400mV
setting.
NOTE: 1mV=1Amp.
·
The Min reading will be the negative current draw .
·
Disable the ignition so the engine doesn
’t start ; crank the engine for 2-3
seconds .
NOTE:
The current clamp measures amps in the direction of electrical flow. Make sure
the arrow on the clamp is pointed in the direction of the current flow in the cable.
Quick Test
Turn the ignition and all accessories OFF, Place the clamp on the battery
cable ,then turn the headlights on . If the reading is not negative, disconnect the
clamp, turn it over and reconnect .
Approximate Aperage Draw
4Cyl
150-180 Amp, Maximum
