Checking Voltage Drop

This method is used to ascertain whether the voltage drop in a wiring harness or across a component, etc., is too great.
1 Connect the positive lead of the voltmeter to that part of the cable or component closest to the power supply.
2 Connect the negative lead of the voltmeter step by step towards the load (item of electrical equipment), which should be switched on.
3 When the circuit is activated, that is, when current flows through it, the voltmeter will show the difference in voltage between the two measuring points.
^ A circuit in perfect working order should not show a voltage drop of more than approximately 1 V.
^ In simple circuits or connectors, the voltage drop should not exceed approximately 0.5 V.