Relay Interference Problem

Discussion in 'General Electronics Chat' started by Peace9Love9Hope, May 2, 2015.

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  1. Peace9Love9Hope

    Thread Starter New Member

    May 2, 2015
    I am an MECP installer. I am trying to get a relay negative trigger from a circuit board in the headlight turn signal switch of a car. It is a data/low voltage system. When I hook a relay negative trigger to the negative trigger on the switch, I get back feed/interference on the headlight switch, because there is positive current grounding through it from the relay, and it changes the resistance/data in the circuit on the switch; which changes the signal to the computer and causes weird things to happen in the car. Once the relay is disconnected, the system goes back to normal.

    I need to know how to isolate this or figure out another way to get this negative trigger. This switch seems to be the only way (after inspecting All Data diagrams for the vehicle), because after this constant signal is sent to the computer of the vehicle, the computer changes it to a non-constant/pulsing signal that I can't use.

    My intent is to get a constant trigger for when either of the turn signals are started; so that I can switch an LED circuit to the turn signal circuit, instead of the parking light circuit it is at normally. On older cars you could hook into the negative trigger at the Flasher. These newer cars use a computer to flash the blinker which makes it more difficult.

    Any ideas?
  2. Ramussons

    Active Member

    May 3, 2013
    You have just violated this forum's T&C. This discussion will be terminated.
    You may be better off posting this query on some other forums like, say,
  3. bertus


    Apr 5, 2008

    I am closing this thread as it violates AAC policy and/or safety issues.

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