Circuit Analysis Using Jumper Wires (Creating Substitute Circuits)

Jumper wires may be employed for circuit analysis.
CAUTION:
- Always use fused jumper wires - the recommended universal-testing jumper wire fuse is 2-5 amperes; larger fuse ratings should be used only in special circumstances.
- Use flex probes or equivalent to prevent connector terminal damage (flex probes are not intended to carry higher currents necessary to operate motors such as a cooling fan or blower motor).
- Follow service information testing directions when using jumper wires to avoid component or harness damage due to incorrect jumper connections.
- Never repair a circuit by adding a new wire in parallel to the old one (overlaying the circuit) without fully understanding what caused the circuit to fail. Always find, examine, and repair the fault to correct the root cause and to repair any adjacent wiring that has been damaged.