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How To Do Voltage Drop Test. Voltage will always follow the path of least resistance. Otherwise go to the next section Power Circuit Voltage Drop Test Checking Engine Grounds.
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If you are checking wiring for power checking for ground or an open you can. Your battery should have a minimum of 124 volts If it is less than 124 volts charge the battery and repeat the test. A circuits wiring and connections should have next to no resistance and as such all voltage should be used through the load.
A voltage drop test is the only effective way to find excessive resistance in high amperage circuits.
This method is fast and efficient in comparison to monitoring current and removing fuses. Using this method prevents the vehicle from waking up during the test causing you to have to start over from sleep mode. To test the Ground side of the circuit Figure 2 follow the steps below. Your trouble point will be the previous one to this point.
