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Old 08-04-2012, 06:12 PM
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How to wire off road lights to power the switch only when key is in ignition?

Is this at all possible? I have been told to use the accessory circuit at the car cig lighter but I am not sure how this would work as it has power going to it all the time.
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Old 08-05-2012, 03:11 PM
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Re: How to wire off road lights to power the switch only when key is in ignition?

There is a blank fuse slot on the block under the dash that you can use. That only gets power when the ignition is on.



Here is a quick diagram of how I wired all mine in. The ACC is the wire coming from the fuse block. I didn't draw it in the pic, but I installed a 5amp fuse into the wire to protect the circuit. On the relay (30) is power from the battery, (85) is from the switch, (86) is ground, and (87) is the output to the device.



With this setup I can leave any or all of my auxiliary switches on and when I turn the ignition off everything will shut off. It is a good idea that way if you forget something in on or bump it and not know it is on, then just by turning the ignition off it won't drain your battery.
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Old 08-05-2012, 05:10 PM
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Re: How to wire off road lights to power the switch only when key is in ignition?

You ran all your switches from that single terminal?
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Old 08-05-2012, 06:51 PM
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Yes. The ACC lead isn't providing the power to the devices so there isn't much of a draw. All it is doing is providing illumination to the LEDs in the switches and trips the relays when the switch is activated.
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Old 08-05-2012, 08:18 PM
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Re: How to wire off road lights to power the switch only when key is in ignition?

So I think I am confused then. You are not running the power from the switches to the ACC?
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Old 08-05-2012, 11:53 PM
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No the ACC powers the switch, you flip the switch and it sends trigger power to the relay, the relay takes the power it is given from the battery and sends it to the device.
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Old 08-06-2012, 12:22 AM
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Re: How to wire off road lights to power the switch only when key is in ignition?

you can get "add-a-circuit" fuses they plug into the empty fuse location, then you can install a fuse in them for your added circuit. this way your circuit is protected and its a simple plug and play...



If you use one like this you can even use a used fuse position (one of the fuses is for the original circuit, the other is for the jumper wire).
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Old 08-06-2012, 12:28 AM
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Re: How to wire off road lights to power the switch only when key is in ignition?

Do they make those for the small fuses, because that is whats under the dash?
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Old 08-06-2012, 12:59 AM
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Yep, its what I use to turn on my amp.

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Old 08-06-2012, 09:06 AM
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Re: How to wire off road lights to power the switch only when key is in ignition?

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Originally Posted by omelet View Post
No the ACC powers the switch, you flip the switch and it sends trigger power to the relay, the relay takes the power it is given from the battery and sends it to the device.
On your diagram are the switches up at the very top of the page? Because to me it looks like the power for the switches goes to the ACC.
The wire you have plugged into the ACC terminal where is that going to? I am sorry for seeming so dense here.
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Old 08-06-2012, 10:45 PM
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Re: How to wire off road lights to power the switch only when key is in ignition?

Yes those are the switches up top. The ACC is the fuse block power that feeds the switches (green). That is what I have an inline fuse on. The other wires on the switch are the two grounds per switch (black) and the switch to relay feed (red).

This is the view of the back of the switches. The red wire is what I made to jump all the way across for the ACC feed and the black is the ground.



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Old 08-07-2012, 12:19 AM
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Re: How to wire off road lights to power the switch only when key is in ignition?

Awesome! I think I understand now. Why two grounds per switch though? And where did you get your switches? I ordered from someone before, but since I have moved I have lost the information.
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