Electrical schematics show the proper functioning state for every electrical circuit in a refrigerator, such as the light, ice maker, motors and dispensers, and help someone troubleshooting a refrigerator know where and what to check for repairs. Wire color coding on schematics assist by giving a visual repair aid.
A multimeter is necessary for using an electrical schematic when performing refrigerator repairs. An expensive unit is not necessary, as long as it reads resistance and AC voltage. The schematic gives the location of each circuit and provides the correct load, or resistance, for each contact. The color coding helps the repairer locate the correct wire to check with the multimeter.