fog light/driving light relay feedback

Discussion in 'The Projects Forum' started by Jeeps, Oct 4, 2012.

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  1. Jeeps

    Thread Starter New Member

    Oct 4, 2012
    Hello. I am a Army mechanic I understand circuts and diagrams but reading much of the threads I have no idea what others are talking about.
    I have a Jeep and installed driving and fog lights tied to high and low beams.

    I am running a factory lighted switch to control the ground to a relay to a diode to the low beam power. Off the same factory switch to a second relay to diode high beam power.

    My theory is when you have the factory switch on and switch from high beam to low beam the relays should switch, thus switching driving and fog lights.

    Probem is when I go from high beam to low beam it does not actuate the relay until you shut off the factory switch and turn it back on. I am not sure if it is related to the colapsing field of the coil in the relay.
    If I bypass the factory switch and ground it before the relay it switches everytime the high beam and low beam is actuated.

    Any ideas would be greatly appreciated. Again I am not an electrical engineer please keep it simple if possible. Thank you
  2. DickCappels


    Aug 21, 2008
    Would you please upload a diagram?

    Most likely, there is still enough current in the relay solenoid to hold it closed. Holding current is usually much lower hand pull-in current. A diagram showing how you actually wired it will probably help us zero in on the exact change necessary.
  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
    Is it possible the current to light the switch is coming through the relay coil keeping it closed?

    I'm also confused about what it is doing. Please post a diagram.
  4. cork_ie

    Active Member

    Oct 8, 2011
    That is exactly his problem. He needs to disconnect the bulb in his switch from ground.
    After that maybe read the AAC terms of service re automotive modifications.
  5. Wendy


    Mar 24, 2008
    Yeah, we allow some stuff, as in connected to cigarette lighters, but I'm afraid this one is not in that class.

    The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

    Another good forum that shares many of the same membership is . Good luck.
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