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Thread: Troubleshooting trailer turn signals

  1. #1

    Default Troubleshooting trailer turn signals

    I have a Ford Ranger with a factory 4 pin connector. I used to pull a popup camper, so it plugs into a 7 pin connector. I think it's functioning properly.

    I've assembled a Harbor Freight utility trailer. The lights sort of work, but there's an issue.

    Symptoms: If if just use the turn signals they won't work. If I turn on the parking lights on the truck, then all the lights on the trailer come on and the turn signals function properly.

    Ideas?

  2. #2
    Moderator Alaric Darconville's Avatar
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    Default Re: Troubleshooting trailer turn signals

    Quote Originally Posted by PiperBob View Post
    I've assembled a Harbor Freight utility trailer. The lights sort of work, but there's an issue.

    Symptoms: If if just use the turn signals they won't work. If I turn on the parking lights on the truck, then all the lights on the trailer come on and the turn signals function properly.
    "Hazard Fraught"

    Does the stop lamp function work normally?

    I'd check the grounds-- make sure the trailer's lamp assemblies actually connect to a ground wire-- sometimes to save costs a lamp assembly might be connected to the trailer frame instead of to a ground wire.
    Last edited by Alaric Darconville; 04-11-2017 at 12:35 PM.

  3. #3

    Default Re: Troubleshooting trailer turn signals

    Sorry for the delay in responding. A giant oak fell in our yard so I haven't been able to get back to the trailer until yesterday (busy chopping wood).

    It's all working fine now, so I can only assume I didn't have the plug in well enough or something. I'll put some silicon grease on the pins.

  4. #4
    Moderator Alaric Darconville's Avatar
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    Default Re: Troubleshooting trailer turn signals

    Quote Originally Posted by PiperBob View Post
    Sorry for the delay in responding. A giant oak fell in our yard so I haven't been able to get back to the trailer until yesterday (busy chopping wood).
    At least it didn't smoosh the truck or trailer.

    It's all working fine now, so I can only assume I didn't have the plug in well enough or something. I'll put some silicon grease on the pins.
    First troubleshooting step is just check all the connections. Unplug/replug the usual connectors and such.

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