What procedure should be followed when connecting electrical systems between vehicles?

The procedure that emphasizes matching the color-coded wiring is crucial when connecting electrical systems between vehicles because it helps ensure that the connections are made correctly. Different wires often serve specific functions, such as power supply, ground, or signal transmission, and matching colors typically indicates that you are linking the correct wires intended for the same purpose. This adherence to color-coding minimizes the risk of electrical shorts, miscommunication between systems, or even damage to the vehicles involved.

By following this practice, you can ensure that connections maintain the integrity of both vehicles' electrical systems. This approach is especially important in complex connections where multiple wires may be involved, as incorrect wiring could lead to system failures or hazardous conditions.

While considering other options, ensuring all systems are turned off is indeed a prudent safety measure, but it does not directly facilitate correct connections. Referring to the vehicle manual provides vital information but may not cover color coding in detail for every vehicle type. Similarly, using universal connectors might imply compatibility, but this approach may overlook the specifics of wiring systems that color-coded connections address effectively.