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Thread: Relays and Inverters

  1. #1
    Banned NightHunter's Avatar
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    Relays and Inverters

    How can I setup a relay to switch the power to my inverter when the ignition is switched to accessory, and keep power on for 5-10 seconds while engine cranks. I have looked at tank circuits and other things, but I am using a inverter for power so things are a little different I think. I have search a lot of threads but they are either so old that they dont exist anymore or they have links in them that are dead. Please let me know. I know this is probably a simple answer but I struggle a little with relays..

    THanks for the help...

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    FLAC robiewp's Avatar
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    How can I setup a relay to switch the power to my inverter when the ignition is switched to accessory, and keep power on for 5-10 seconds while engine cranks
    you want the inverter POWERED while the engine cranks? I'll assume you meant the opposite but first address having it powered while 'accessory' is on.
    If you remove the panel above where your legs are when you sit on the driver's side, there should be a 6 pin connector going into the key rig. there is a wire which, when the key is switched to accessory, pushes +12vDC. you can test this with a multimeter or you can track down a wiring diagram used for security systems. you can wire this either as your source of power for the computer, or as what switches the position of the relay to on.

    as far as switching/ keeping the power off while the engine cranks, you can find in that same harness the "starter" wire. Relays can both be set up to be on unless powered, or off unless powered. If your relay is wired to be on unless powered, you can shut the power off while the engine cranks with this connection.

    Sorry if i didn't even answer your question. give me more details if i misunderstood, and i'll see if i can help ya out.

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    THanks I know that much, the thing I am trying to do is setup a relay so I can run a power wire directly from the battery, but switched with a relay from the accessorie wire. I know all about the wiring under the dash, I am just relay challenged and dont know how to wire them.

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    FLAC robiewp's Avatar
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    come back in 5 minutes. I'm detailing a relay diagram in MS paint

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    FLAC robiewp's Avatar
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    got a splinter on my way to the shed in bare feat. Doh!




    If you were to connect the "to computer" connection to the "unused pin" you would get a circuit that had the computer on, unless you had the key in the accessory position. A setup such as that with an additional relay, would allow you to kill power to the computer while the starter was being cranked.

    Any help?
    Rob

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    Thanks that was a huge help. Just what I was looking for. So your diagram will cut the power to the computer unless the ignition is powering the accessory wire. I dont care if I have to reboot every time or I just cut the power to the computer. I just needed something to cut the power with out a toggle switch.

    THANKS

  7. #7
    FLAC robiewp's Avatar
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    that's the theory :-)
    car computer rev 5: 8" lilliput and usual suspects

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    By Krash in forum General Hardware Discussion
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    Last Post: 08-04-2003, 12:23 AM

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