How To Use A Voltage Tester On A Car

A examination low-cal is a simple device that tin can tell you if ability or footing is present at a particular circuit or fuse. The test low-cal consists of a sharp probe, indicator lite bulb and a wire lead with a prune. This tool is like shooting fish in a barrel to use and is reasonably priced on Amazon (about $twenty.00 US) and pertains to all 12 volt systems. EV's use a 12 volt arrangement to run everything simply the master drive motor, and most have a conventional 12 volt battery including Tesla.

test light

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Before you begin testing it is good practice to brand sure the test low-cal works. This is easily done by connecting the examination light atomic number 82 to the negative side of the battery and and then touching the point of the probe to the positive side battery final, the exam light should light up.
test light testing

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A pop utilize of a test light is to check for power and the condition of the fuses in the fuse panel or power distribution center (PDC), this should be the first check when a particular accompaniment such as door locks, lighting or ability windows are not working. If you need the locations of a fuse or electrical detail such as a fuel pump relay you lot tin can enquire our experts to supply the data (gratuitous), or consult an online resource such equally AllData DIY (pay). One time the test light is properly grounded (negative side of the battery or any solid metallic part), touch each side of the fuse, both sides should light upwardly which is telling you both the fuse is good, and at that place is power present in the fuse console. Note: Whatsoever solid metallic part of the vehicle such as the frame, engine, radiator core back up is grounded naturally as part of the electrical systems pattern.
test light power check

If the fuse is good the next pace is to see if a detail accompaniment is getting power such as a power window, with the examination light grounded check for power at the switch, so the window motor. If there is power at the switch but none at the motor with the switch activated, yous know the window switch is bad, if there is power at the motor the motor is bad, bold the grounds are practiced, which nosotros will show you lot in the adjacent steps.
window switch test light

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Delight sentinel this video of the chore existence washed, so continue down the guide to glean boosted helpful information.

Here a mechanic is testing the power feed to the fuel pump from under the vehicle, with the test light grounded the abrupt bespeak is pushed through the wire insulation to contact the internal wire. This is washed by locating the wiring harness headed to the fuel tank and while using a wiring diagram provided by our skillful to ostend the colour of the wire, in this case blue, if power is present as in this case the fuel pump motor is bad.
fuel pump power test light

Questions?

Our certified technicians are ready to answer electrical questions for complimentary. We hope you saved money and learned from this guide. We are creating a full set of car repair guides. Please subscribe to our 2CarPros YouTube channel and cheque back often for new videos which are uploaded regularly.