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Capacitors are electrical energy storage devices used in places ranging from large, soda-can–shaped storage devices to smooth voltage fluctuations in audio systems, power supplementary restraint systems (airbags), direct current to direct current (DC to DC) voltage converters, or small ones to smooth alternator voltage output. To prevent potentially dangerous shock hazards, capacitors should be discharged before servicing a vehicle. Discharge techniques include the following:
STEP 1
While using PPE, locate and remove the capacitor from a vehicle, and using a 12 V test light as a load, bridge the positive and negative terminals on the capacitor together. When the light goes out, the capacitor is discharged. Do not simply use a jumper wire to discharge the capacitor because high current discharge may damage the capacitor. The result of an electrical arc could also create an explosion hazard, produce a burn, and may even cause eye damage.
STEP 2
Remove the fuse or disconnect the lead wire from the battery to any capacitor. Switch on the device supported by the capacitor to completely discharge the capacitor. When the device no longer operates, the capacitor is drained.
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