continuity but no voltage - console light

Discussion in 'Electrical Systems' started by Chuck71RS, Dec 1, 2019.

  1. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    Installed a 2005 Hyundai overhead console between the sun visors. Power comes from the BAT terminal on the fuse panel. A single return wire goes to ground that is clean and bare

    Before installing the console, connected directly to the battery and both lights worked

    MM shows voltage at BAT

    Connected to BAT terminal and ground, pushed each switch but neither light came on.

    Disconnected BAT and ground. MM probes on both ends shows continuity when either or both switches are on. No continuity if both are off

    Pulled the bulbs and MM shows continuity

    Connected wires to BAT and ground and MM shows voltage at both sockets.

    Does this mean the bulbs are making enough contact for continuity but not enough to light the bulb, exit the socket and continue to ground?

    Suggestions on what to do please
     
    Last edited: Dec 1, 2019
  2. tom3

    tom3 Veteran Member

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    Not sure where the problem might actually be, but those are sometimes fed full time power and the door or pushbutton switches connect the lamp to ground. Real late model stuff might have a computer controller for those?
     
  3. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    I have a 2004 Hyundai with the same console and it is fed full power without the engine running or key in the ignition for the push button switches turn light the bulbs on and off
     
  4. grzewnicki

    grzewnicki Veteran Member Lifetime Gold Member

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    Using test light, probe the hot side with test light hooked to good ground, then still with test light on hot part of bulb socket hook test light to ground part of socket, if you got power at hot terminal for bulb then it has to be a bad ground. If you cannot hook ground clip to ground part of bulb holder, just reverse it if possible, alligator clip to hot, (maybe the terminal where the wire hooks onto bulb holder and probe tip to ground. Don't know what your bulb sockets look like, if neither one of those is possible just run your alligator clip to a good hot wire (like the 3 wires you have connected with a screw) then probe your ground at the bulb holder.
     
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  5. hubedobeedo

    hubedobeedo 3rd times a charm

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    ground
     
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  6. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    Bulbs were not consistently lighting up when tested with the battery. Found the sockets were not tight against the control panel. Pried up the contact ends, inserted, tested at car battery and lights came on consistently.

    Interior was now down to a ground problem as these guys said
    Added a long jumper to the installed power wire so the console could sit on the trans tunnel. Inserted another jumper into the black console wire lead and probed various ground spots used by other circuits till a bulb came on. Surprised the heck out of me when the first three spots did not light up the bulbs for aftermarket component circuits were grounded here and had worked. Best do some more work on ground locations
     
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