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How do you test an HPS ballast?

4 min read

Asked by: Nicole Schecher

How do you know if it’s the ballast or the bulb?

Take out your current bulbs and replace them with the new bulbs. If the bulbs fail to light up, then 9 out of 10 times the ballast is culprit. You could also try using a multimeter set to measure resistance.

How do I know if my HPS ballast is bad?

Touch the red lead to one of the low voltage feed wires and the black lead to the neutral wire on the transformer. The meter should read between five ohms to 15 ohms. Any higher or lower reading and the ballast is bad.

How long does a HPS ballast last?

4000 – 5000 hours (HPS) 3000-4000 hours (CDM)

What should you use to check the voltage in the ballast?

Test the ballast’s voltage with a multimeter. Attach the multimeter’s leads to the sockets at the ends of the ballast. If the reading is not between five and nine volts, replace the ballast. Adjust the multimeter to measure frequency and replace the ballast if the reading is not between 20 and 50 kilohertz.

How do I test a ballast with a multimeter?

To measure it, set your digital multimeter to around a thousand ohms resistance setting. Connect the black leads to the white ground wire on your ballast. Afterward, test every other wire with the red lead. When you do this test, a good ballast will return an “open-loop” or max resistance.

How do you test a HID ballast with a multimeter?


So number one so I the red lead goes to number one and then the black lead goes to ground that's any good metal point and we should see battery voltage.

How do I know if my ballast is working?

Your other test lead to the wires. And see if your meter still reads open line it should read open line open line if you have an analog meter it should not move.

Do ballasts spoil?

A typical ballast will generally last about 20 years, but cold environments and bad bulbs can decrease this lifespan significantly. You can get a new ballast at a hardware store or home center and install it in about 10 minutes.

How do you fix a bad ballast?

We can cut any wires that are holding the ballast in place. And once we've done this we can go ahead and remove the ballast. From the lighting fixture. Guys once you have the bottles removed.

How can you tell if a ballast is bad?

If your fluorescent lighting is displaying any of the signs below, it could be a symptom of a bad ballast:

  1. Flickering. …
  2. Buzzing. …
  3. Delayed start. …
  4. Low output. …
  5. Inconsistent lighting levels. …
  6. Switch to an electronic ballast, keep lamp. …
  7. Switch to an electronic ballast, switch to a T8 fluorescent.

What happens if you wire a ballast wrong?

If a ballast fails, it can cause a short, burn out tubes or even cause a fire, so it must be replaced. Lights that don’t turn on, fluorescent tubes blackened near their ends, and brown, burnt tube electrodes are all indicators that a ballast is bad.

How do I reset my HID ballast?

Wait for the bulb to shut off and turn on the headlights. After turning off your headlight switch, turn it on again. The ballast was reset.

How do I troubleshoot my HID ballast?

And it still doesn't work you may have gotten a bad bulb. But you also may have a bad xenon ballast there's a simple troubleshooting step that's going to help you determine if you have a bad ballast.

Do HID ballasts wear out?

Heat and moisture are great enemies to your HID ballast. When it is too cold or too hot, the ballast can burn out or fail to start headlights. A combination of heat and constant condensation can also cause severe corrosion over time.