a/c capacitor

  • Nitrodog
    Posts: 848
    July 30, 2010 at 2:00 am #1268513

    Anyone know how to test a capacitor on a a/c to see if it is bad? Thanks

    weldon
    Rochester, Mn
    Posts: 304
    July 30, 2010 at 2:06 am #889967

    Use an ohm meter with the leads disconnected. It should measure >1 Mohm across the leads.

    AllenW
    Mpls, MN
    Posts: 2895
    July 30, 2010 at 2:21 am #889971

    If it doesn’t have the bleed resistor, set a analog meter to ohms, touch the two terminals of the cap, then reverse the leads and touch the terminals again, you should get a spike from your meter.

    Famous last words…:)

    Al

    mccrty_ryn
    Holmen, WI
    Posts: 173
    July 30, 2010 at 3:02 am #889985

    If you have a multi-meter set it to mfds and touch a screw driver across the terminals to bleed it. Touch your leads to the terminals and hold them there until it stops reading. There is a rating on the side of the cap. The rule of thumb is different for start cap. and run cap. One is if the reading is within +/- 10 percent it good. I forget the other one. Make sure to shut the power off and disconnect the cap.

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