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NOTE: Remove the battery cables and thoroughly clean the cable terminals and the battery posts. Reassemble
them before beginning tests.
CAUTION
THE IGNITION SWITCH MUST BE OFF TO PREVENT DAMAGE TO THE VEHICLE COMPUTER WHEN
CONNECTING OR DISCONNECTING BATTERY CABLES.
Battery Surface Discharge Test
The test checks for a low current discharge across the battery case. Dirt, moisture, corrosion are typical causes
of surface discharge. Clean the battery surface with a baking soda and water solution to prevent surface
discharge. However, never let the solution get into the battery.
Positive
battery
cable
Negative
battery
cable
Black
Red
12V battery
Meter setup to measure surface discharge:
• Set the rotary switch to voltage ( ) setting.
• Press the “DC/AC” button until “ ” appears on the display.
• Press the “REC” button (selects the MAX.MIN.AVG function).
• Insert the black lead in the “COM” jack.
• Insert the red lead in the “ ” jack.
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