P15-5 YE/GY 2.5. All leads have an alphabetical designation followed by an individual number. Leads with the same letter and number, e.g. E110, E110-1, E110-2 etc., generally belong to the same function. The following colour codes are used in the wiring diagrams of the manual. The colour codes can also be used in combination, e.g. RD/BU, GY/WH.