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This test checks for efficiency of engine ground.
♦ Set the F-1860’s rotary switch to the voltage position (V).
♦ Insert the black lead of the F-1860 into the COM socket, and the red
cable into the V/Ω
ΩΩ
Ω/RPM socket.
♦ Touch the positive (+) lead to the positive (+) battery terminal and the
negative (-) lead to the negative (-) battery terminal. Take note of the
reading, which will be the starting reference for future readings.
♦ Conect the positive (+) lead of the F-1860 to a clean screw on the engine
block.
♦ Connect the negative (-) lead of the F-1860 to the negative (-) battery
terminal.
♦ Press the MAX/MIN button on the F-1860.
♦ Disable the ignition so the engine doesn’t start; crank the engine for 2-3
seconds.
A voltage drop in excess of 0.5 V indicates defective ground.
Clean and inspect the battery cable connections and the ground, and test again.
IMPORTANT:
Repeat this test when the engine is completely warmed up. Heat expansion
may cause increased resistance.
(2) Negative (-) Chassis Ground
This test checks for chassis ground efficiency.
♦ Set the F-1860’s rotary switch to the voltage position (V).
♦ Insert the black lead of the F-1860 into the COM socket, and the red
cable into the V/Ω
ΩΩ
Ω/RPM socket.
♦ Keep in mind the commented reference reading from the previous engine
ground test.
♦ Connect the test lead to the point in the wheel arch or wherever the
vehicle’s ground is connected.
♦ Connect the negative (-) lead of the F-1860 to the negative (-) battery
terminal.
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