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Discuss Weird problem with reverse light in the Auto Electrician Forum area at ElectrciansForums.co.uk.

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  1. Skxawng
    Offline

    Skxawng New EF Member

    Location:
    England
    Hi, I'm having a strange problem with a reverse light bulb. I replaced the bulb with a new one as it didn't light up but it still didn't work. I've tested the bulb and it works (tried several new ones as well). I've tested the socket with a meter and get 11.8v. To rule out potential bad connection I've put 2 wires directly into the correct pins on the connector and tried the bulb- still nothing.
    If I monitor the voltage, it stays at 11.8v until the bulb is in the circuit and then it drops to 0v. Then I remove the bulb and it goes back up to 11.8v.
    Any ideas what may be going on?

    Thanks in advance! :)
     
  2. ruston
    Offline

    ruston Trusted Advisor

    Location:
    Northumberland
    You have a bad connection . Probably Earth.
     
  3. Skxawng
    Offline

    Skxawng New EF Member

    Location:
    England
    Thanks, I'll have a look
     
  4. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    The reverse light works on a switch that connects the wire to ground.
    There is either a break in a wire, a wire has become disconnected at the gear box, the switch is broken or the selector is no longer operating the switch.
    Find the wire or wires that connect to the switch underneath the car on the gear box.
    With the engine off but the ignition on so all the lights on the dash are lit, select reverse and jack the car up.
    If there is only one wire, disconnect the wire and try touching it to the body of the gear box while someone looks to see if the reversing light lights up.
    If it lights up, the switch is broken or the gear selector is no longer operating the switch.
    Replace the switch, if it still doesn’t work, the gear box needs taking apart.

    If the reversing lights don’t light up when you touch the wire to the body of the gear box, the wire is broken.

    With 2 wires, one will be live, the other will connect somewhere to ground.
    Test the wires to find the live, then test the other wire for continuity with ground.
     
  5. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    failing which, try not to go backwards in the dark.
     
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  6. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
    And if you must, have someone in the back seat pointing a torch out the rear window.
     
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  7. Skxawng
    Offline

    Skxawng New EF Member

    Location:
    England
    Would that be the case even though Im getting 11.8v at the rear light connector when reverse gear is selected?
     
  8. Skxawng
    Offline

    Skxawng New EF Member

    Location:
    England
    Ruled out earth issues. Used a good earth instead of the common on the connector. Again reads voltage between the reverse light pin and earth but won't light a bulb. Must be not enough current. Might the switch on the gearbox be corroded? IMG_20181009_225908.jpg
     
  9. ruston
    Offline

    ruston Trusted Advisor

    Location:
    Northumberland
    Have you checked the lamp holder , and check that plug in pic with a load on it.
     
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