For all electrical components are working properly, you must obtain the correct current flow. Low power to make a bulb light obscured. Low coil power of a compressor clutch reduces the magnetic field and can then slip the clutch or not to engage. To exist for an orderly flow of current, the circuit must have voltage applied to the correct source and free of any resistance "undesirable" in the circuit. And the best way to test is to measure the voltage drop withCircuit "work".
Here are the steps to perform a voltage drop test:
1 Connect the negative instead DVOM negative battery.
2 Connect the positive lead DVOM positive terminal of the battery and measure voltage. To record this.
3 Connect your DVOM positive results on the positive side of the load close to the load as possible.
4 Operate the circuit and record your measurement.
5 ConnectYour DVOM tested positive to the negative side of the load of the load as close as possible.
6 Operate the circuit and record your measurement.
Let's take a closer look at these steps. First, we want to test the integrity of the entire circuit as tips on battery is a must. You can use an extension cord for your DVOM so that you can always connect the ground terminal lead-acid battery with the tool negative. Secondly, it is important to knowVoltage source. If the battery is weak to begin with, the circuit is already working with a handicap. Indeed it is better to measure the voltage source with the engine running, and use these as a starting value.
In the third phase, you are sure that all sources of tension to the final destination ... the load to arrive. First, that the burden of insurance as close as possible to test the entire path. On the positive side of the load, you should read within your source of 0.50 voltsVoltage, that is, if you start with 14.56 volts should be read not less than 14.06 volts. This applies to most of the basic circuits. If the diagnostic module, a control circuit are connected, you can search for even less.
In step 5, you are stealing the load for uninvited guests behind us. Remember, all the potential voltage of the load were used. If a voltage reading of 0.50vo more to come, there is someone else to steal your home from the primary potentialComponent. This source side may ultimately be found to "downstream" of the load, possibly at the terminal of the battery. However, it is still dependent on the voltage at 0.50v. This is because the available voltage divided proportionately between the two, and tends to build new technical tests of power failure. Remember, the current flows directly through the circuit. Even if the module circuits connected a little 'less is more. Stay as closethe load, how can you ensure that review the entire earthly journey.
On the thinking goes, the current flow only to the circuit and it works. Do not forget to run the circuit, if your measurements.
My reading is out of reach. And now?
The experience is a guide here, as in all things. Unwanted contact resistance usually results from poor connections or bad reasons, either in a connector bundle or a switch, and is in one hand, from the episodeMeasure the distance. For the little uninvited guest, all you have to do, "trace" of the store behind the battery. Here you have to spend time with a scheme for the circuit you are working and a little 'common sense. For example, if there are parallel branches on the track, are all affected sectors? If so, concentrate on that section of wiring for all. Otherwise, this section, which is unique to the component, attention to diagnose. Back to Batteryon points of logic (harness connections, electrical contacts, joints, etc.) until the DVOM is read back to normal. That is, you pass the unwanted guest, and all you have to do is browse through the last two points of measurement.
Some degree of tension on the ground next to a payload is normal. If there is no reason at all, it is a source of tension on both sides of the load measured. If the land side measures 0.0 volts to receive the money and the componentsource of proper voltage, then the burden is likely to have an open interior.
What happens if both sides of the test load, but still not working properly? When tested directly to the load, there is only one area left untested ... the load. In this case, you probably have a faulty component. A good example is a magnet, not mechanically, electrically failed.
Also remember not to use abbreviations in the first test. It 'very important that the entire testIn progress is the power of and back into the battery. A common mistake is to provide a chassis ground, the bottom line only during the test drive. But do not forget that the point of the frame on the ground has yet to return to battery, usually through a few more connections before the earthly journey is completed. The HVAC module may be ineffective simply a poor connection to the connector bulkhead or firewall ground loops, and you lose if you cut corners. Right, Done a test voltage dropis to quickly isolate which side of the circuit is the problem and save time in the diagnostic process.
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