Terminal and Circuit Identification

Most terminals are identified by numbers on the components and harness connectors. The terminal numbers for the major electrical connections are given in CURRENT FLOW DIAGRAMS.

Though many terminal numbers are unique, used only once to identify a particular terminal, several numbers appear in numerous places throughout the electrical system and identify certain types of circuits. A letter suffix is sometimes added to the number to distinquish between two different circuits, or between two parts of the same circuit. Table a lists several of the most common circuit numbers, and identifies the circuit type and the wire color normally used.

Table a. Terminal and Circuit Numbers