General

ATC System Electrical Wiring Diagram And Continuity Test:

Refer to the image to assist in performing component and system electrical wiring and continuity tests. The blower switch chart also provides blower motor voltage and current information for each blower switch position.
1. On all electrical circuits, continuity must exist from the source of power (battery), to the unit where the power is used, and back up to the source of power through the ground terminal. A check at each connection in a circuit, starting at the battery, will locate an open circuit or will show that the circuit is complete.
2. An ohmmeter or self-powered test lamp connected at any two points of a circuit with the power removed from the circuit, will show if the circuit between the two connections is open or continuous.
3. If the meter does not move or has a light movement (high resistance), the circuit may have a poor connection or broken wire. If the bulb does not light, the circuit is open.
4. If the meter movement is great or full (low resistance), the circuit is complete. If the bulb lights, the circuit is continuous.