K 1500 Suburban 4WD V8-6.5L DSL Turbo VIN F (1999)
5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or
performing other operations.
6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded.
7. Press the MIN MAX button once in order to display the MAX value and note the value.
8. Press the MIN MAX button again in order to display the MIN value and note the value.
9. Determine the difference between the MIN and MAX values.
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If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists.
Repair the condition as necessary.
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If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does
not exist.
Testing For Proper Terminal Contact
It is important to test terminal contact at the component and any in-line connectors before replacing a suspect component. Mating terminals must be
inspected to ensure good terminal contact. A poor connection between the make and female terminal at a connector may be the result of contamination or
deformation.
Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector
itself, or exposing the terminals to moisture and dirt can also
cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or
intermittently open circuit.
Deformation is caused by probing the mating side of a connector terminal without the proper adapter, improperly joining the connector halves, or
repeatedly separating and joining the connector halves.
Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit.
Round Wire Connectors
Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to J 38125-B Terminal Repair Kit or the J 38125-4
Instruction Manual for terminal identification.
Follow the procedure below in order to test terminal contact.
1. Separate the connector halves.
2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or
between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that
shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body.
3. Using an equivalent male terminal from the J 38125-B, test that the retention force is significantly different between a good terminal and a
suspect terminal. Replace the female terminal in question.
Flat Wire (Dock and Lock) Connectors
There are no serviceable parts for flat wire (dock and lock) connectors on the harness side or the component side.
Follow the procedure below in order to test terminal contact.
1. Remove the component in question.
2. Visually inspect each side of the connector for signs of contamination. Avoid touching either side of the connector as oil from your skin may
be a source of contamination as well.
3. Visually inspect the terminal bearing surfaces of the flat wire circuits for splits, cracks, or other imperfections that could cause poor terminal
contact. Visually inspect the component side connector to ensure that all of the terminals are uniform and free of damage or deformation.
4. Insert the appropriate adapter from the J 42675 Flat Wire Probe Adapter kit on the flat wire harness connector in order to test the circuit in
question.
Measuring Voltage
NOTE: Refer to Test Probe Notice in Cautions and Notices.
The following procedure measures the voltage at a selected point in a circuit.
1. Apply power to the circuit.
2. Set the rotary dial of the DMM into the V (AC) or V (DC) position.
3. Connect the positive lead of the DMM to the point of the circuit to be tested.
4. Connect the negative lead of the DMM to a good ground.
5. Operate the circuit.
6. The DMM displays the voltage measured at that point.
Measuring Voltage Drop
NOTE: Refer to Test Probe Notice in Cautions and Notices.
The following procedure determines the difference in voltage potential between two points.
