Fundamental of electrical automotive engineering - Jumper Wires

Fundamental of electrical automotive engineering - Jumper Wires. How to use a jumper wire to determine which component at the circuit may be at fault ?.
Jumper wires are simply a length of insulated wire with terminals, connectors, or alligators on each end. The wire gauge should be appropriate to carry the intended current. Sometimes a fuse device is included for circuit protection.


Fundamental of electrical automotive engineering - Jumper Wires


A jumper wire creates an alternative path with a known-good conductor for current to flow around suspected components in a circuit. It can be used to temporarily ''jump'' across a suspected open circuit or defective component. If the circuit works properly with the jumper wire, but does not work without it, then the circuit has an open. The jumper can be subtituted for wires on the power side or on the ground side.


Fundamental of electrical automotive engineering - Jumper Wires


Jumper wires can be used to bench test a load device to confirm proper operation before installation. Always use caution when handling jumper wires to prevent them from tauching, grounding, or creating any condition that could cause a short. Be sure to use jumpers with a wire gauge that is appropriate to carry the intended current.


Fundamental of electrical automotive engineering - Jumper Wires


Safety



Fundamental of electrical automotive engineering - Jumper Wires


A jumper wire is typically used to bypass components that have low resistance such as sections of wire, switches, and connectors. Never use a jumper to bypass a load device. Bypassing the resistance of the load can create a low resistance  increases current flow. Excessive current flow in the circuit can over heat wires, components, or cause a circuit protection device to open the circuit.

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