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Open circuit

To find the break in the circuit, connect one lead of a control bulb to the negative terminal of the battery or (weight) of the car.

Connect the other probe to connection in a checked chain, preferably located as close as possible to the battery or fuse.

Apply power to the circuit. Do not forget that some chains pressure is present only if you turn the key in the ignition lock in certain position.

If pressure is present (about what the lighted up will testify control light or voltmeter indications), it means that part of the chain between the compound and the battery is working.

Continue to check the rest of the circuit in the same way.

When you find the point where the pressure is absent, it means that the malfunction source lies between this point and the last point where the voltage is present. Most problems are caused by bad connection.