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Thread: Powerup Inverter question

  1. #1
    Constant Bitrate
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    Powerup Inverter question

    My CD Kenwood CD deck, there is a BLUE going to the Amp to power it up.
    Can I tap into that line to power on/off my inverter with a relay?

    12v from Headunit to Relay (86) ß Relay code
    12v from the Battery to 30A fuse to Relay (30)
    From Relay (87) to 30A fuse to Inverter
    From Relay (85) to Car frame to Ground

    Do I need a Diode after tap in 12v BLUE wire before it goes to the Relay?
    So that way there won’t be any power from the Iverter flow back to my Speaker Amp.
    Hopefully I explained it clearly.

    Thanks,
    ICET

  2. #2
    Constant Bitrate P4_2.66GHz's Avatar
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    No diode is needed for the situation you described.
    It is, however, recommended to wire a diode parallel to the relay's coil that would be in reverse of positive/negative. (Positive) --|<|-- (Ground).
    I am not sure what the current is on the remote wire you're asking about, if it is enough to keep a relay powered, without burning anything. Read what the current rating for it is.
    Why not simply find an ACC wire and use that? Your radio should have one coming into it. Those are usually 10Amp + rated.

    P.S.
    I am not sure about the relay wire numbers, as I am used to seeing them on diagrams.

  3. #3
    Constant Bitrate
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    Thanks for the reply
    So u r saying that if I tap in ACC wire to the Radio then I don’t need any Diode parallel to the relay?
    I got it from Autozone 30A Relay…
    I plan to get it from Radioshack but this one is like 2 bucks cheaper….
    Thanks…

  4. #4
    MySQL Error MatrixPC's Avatar
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    You don't need diode if you just tap to the ACC wire of the radio or the remote amp of the radio. I think the BLU wire has enough power to turn on the relay and an amp. My Alpine radio can turn on the 2 amps, 1 equalizer, and a relay.
    You may have to put a diode on 85 and 86 (coil) of the relay. Which way the diode should be, well, the end with the stripe is to the + side (86 in your case).
    Best way to find the ACC wire in the car is the CIG lighter/AUXilliary power port.
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  5. #5
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    just to make sure that i understood u guys...
    attached is the picture...i drew...

    thanks for the help
    icet
    Attached Images Attached Images  

  6. #6
    Constant Bitrate P4_2.66GHz's Avatar
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    The diode would go to 85, 86 connectors. 85 has the stripe going the right way.
    The reason for it, the relay's coil may send a reverse pulse when it is untriggered.

  7. #7
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    Quote Originally Posted by icet
    My CD Kenwood CD deck, there is a BLUE going to the Amp to power it up.
    Can I tap into that line to power on/off my inverter with a relay?

    12v from Headunit to Relay (86) ß Relay code
    12v from the Battery to 30A fuse to Relay (30)
    From Relay (87) to 30A fuse to Inverter
    From Relay (85) to Car frame to Ground

    Do I need a Diode after tap in 12v BLUE wire before it goes to the Relay?
    So that way there won’t be any power from the Iverter flow back to my Speaker Amp.
    Hopefully I explained it clearly.

    Thanks,
    ICET
    I was wondering why you would not just put in an inline switch to from the battery to inverter. That way you could just flip a switch to turn it on. Do does you inverter survive the crank and have you figured out a way to get the computer to do a soft shutdown with an inverter.
    Thanks

  8. #8
    Constant Bitrate
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    Quote Originally Posted by lookitslo
    I was wondering why you would not just put in an inline switch to from the battery to inverter. That way you could just flip a switch to turn it on. Do does you inverter survive the crank and have you figured out a way to get the computer to do a soft shutdown with an inverter.
    Thanks

    because i want to use to headunit on/off button to power everthing that hook up to my inverter so i don't have to flip too many switches.
    thanks...

  9. #9
    Constant Bitrate Adam432823's Avatar
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  10. #10
    Variable Bitrate craigyb's Avatar
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    Your relay idea was good, but the shutdown controller was a much better idea.

    How about using the blue +12v output to trigger the shutdown controllers acc line. Then the PC powers on with your ICE and cleanly shuts down 5 mins after you turn off your ICE.

    Just a thought

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