H2 V8-6.0L (2004)
J 34142-B 12 V Unpowered Test Lamp
NOTE: Refer to Test Probe Notice in Service Precautions.
A test lamp can simply and quickly test a low impedance circuit for voltage.
The J34142-B is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads.
To properly operate this tool use the following procedure.
1. Attach one lead to ground.
2. Touch the other lead to various points along the circuit where voltage should be present.
3. When the bulb illuminates, there is voltage at the point being tested.
Using Connector Test Adapters
USING CONNECTOR TEST ADAPTERS
NOTE: Do not insert test equipment probes into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A
deformed terminal can cause a poor connection, which can result in system failures. Always use the J 35616-A Connector Test Adapter kit or the J 42675
Flat Wire Probe Adapter Kit in order to frontprobe terminals. Do not use paper clips or other substitutes as they can damage terminals and cause
incorrect measurements.
Using Fused Jumper Wires
USING FUSED JUMPER WIRES
TOOLS REQUIRED
J 36169-A Fused Jumper Wire
IMPORTANT: A fused jumper may not protect solid state components from being damaged.
The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a
20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested.
Circuit Protection - Circuit Breakers
CIRCUIT PROTECTION - CIRCUIT BREAKERS
A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short
or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit
breakers are used.
Circuit Breaker: This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of
the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high
current is removed.
Positive Temperature Coefficient (PTC) Circuit Breaker: This type greatly increases its resistance when excessive current passes through it. The
excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively
open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the
voltage is removed the circuit breaker will re-close within a second or 2.
Circuit Protection - Fuses
CIRCUIT PROTECTION - FUSES
