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Connect:
• Red test probe to a clean spot on the engine block.
Press the “REC” button (selects the MAX.MIN.AVG function).
Disable the ignition so the engine can’t start and crank the engine for four to ve seconds.
This connection has two connectors, one wire, one ground and one cable terminal-to-battery post; a voltage
drop of more than 0.5V indicates a poor ground circuit.
Clean and inspect the battery cable connections and the ground connection and test again.
NOTE: Repeat the test after the engine has thoroughly warmed up. Heat expansion may change voltage drop.
Negative Chassis Ground Efficiency Voltage Drop Test
This test checks for chassis ground efciency.
12V Battery
Red
Black
Engine
Block
Chassis
Ground
Meter setup to check voltage drop:
• Set the rotary switch to voltage ( ) setting.
• Press the “DC/AC” button until “ ” appears on the display.
• Insert the black lead in the “COM” jack.
• Insert the red lead in the “ ” jack.
Touch the black test probe to the negative (-) battery post and the red test probe to the positive (+) battery post;
this reading is the base voltage to compare your test voltage reading against.
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