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Car headunit wiring query.. Calling all electrical guru's!

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  • #16
    Originally posted by Thirteen13 View Post
    Going off how i have described the numbers ? The blue/white amp wire i assume supplies the power that connects to pin 85, meaning that i need to solder the cathode onto pin 85 and the anode onto pin 86, as pin 86 has the ground on it.?
    im a bit lost myself LOL
    Going off your wiring description, the pins on the relay are irrelevant for the diode orientation (assuming you have the two correct pins for the coil) the cathode of the diode should connect to whereever the blue wire from your head unit connects and the anode should connect to the black wiring.

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    • #17
      Originally posted by artman View Post
      If all you are wanting to to do with your head unit remote turn on wire is trigger the relay, wire this wire to one side of the relay coil, the other side of the coil to earth. The relay coil doesn't have a polarity
      As the magnetic field around the coil collapses when the relay turns off it induces a current in the coil, resulting in a negative spike (generally in the vicinity of -400V) back into whatever is driving the relay, depending on what the headunit uses to switch the remote output this sort of back EMF may quickly kill it, by placing a reverse biased diode across the coil provides an alternative path for the spike, thus preventing it from damaging the drive electronics.

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      • #18
        I see, thanks for the info, I have never considered this. I have run a relay off the amps remote lead previously a few times with no issues, maybe those particular decks were not effected.

        Cheers

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        • #19
          i ran 3 amplifiers off a 30A bosch relay and just used the remote trigger wire from the head unit to switch the relay on. ran that setup for about 1.5 years and never had a problem, still using the head unit now on a much smaller setup (one amplifier) and have removed the relay and just use the remote trigger from the head unit straight to the amplifier. still works fine.

          a Pioneer head unit like yours isn't easy to kill, i don't think you'll really need the diode, but if you want it then go ahead.

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