- 1). Obtain a sample wiring diagram representing a system of a vehicle. Try factory repair manuals, websites, or your vehicle's owner's manual as a source for a diagram.
- 2). Learn the symbols for the basic components on a wiring diagram; these are the switch, resistor, ground point, and battery. Remember the standard variations that exist for the battery (variable battery) symbol and the ground (case ground) symbol .
- 3). Memorize what the advanced component symbols look like and what the labels near them stand for. They might be used to designate component positive and negative terminals, component pin numbers, or component electrical or circuit values. Obtain a guide with a full listing of symbols if you come across a schematic with something that is not labeled.
- 4). Learn how the wires and connections are drawn. Remember a dot symbolizes that two wires are connected, while a wire with no dot symbolizes wires that cross physically but are not connected. Note that the notations like "BRN/WHT" or "LT GRN" denote the colors of the wires themselves.
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