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NOTE:
The allowable voltage drop values listed in the table do not apply to circuits that use aluminum cables.
Normally, maximum voltage drop should not be more than 0.1V per wire, ground, connection, switch, or
solenoid. You can determine the typical voltage by adding up the values from the above table. For example, the
typical voltage drop from the negative battery post to the starter drive housing (negative test probe connected to
the negative battery post and the positive test probe connected to the starter drive housing) should not exceed
0.4V. This connection consists of two connectors, one wire, and two grounds.
If the voltage drop reading is within the allowable maximum voltage drop specification, the circuit's resistance
is acceptable.
If the voltage drop reading exceeds the maximum allowable voltage drop, the point of excessive resistance can
be located by checking the voltage reading at each connection and cable end. When a sharp decrease in voltage
drop is observed, the cause of the excessive resistance is located between that test point and the previous test
point.
Battery Ground to Engine Block Voltage Drop Test
This test checks for engine ground efficiency.
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 "
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.
40
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Red
Engine
Block
12V Battery
" jack.
Black
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