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Old 03-06-2012, 04:27 PM   #1
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Question 12V Wiring Question

Here’s a question for you 12V electrical experts:

I would like the ability to disable my DRL’s when maneuvering into a campsite at night. I intend to install a lighted rocker switch for this purpose. I would like the switch to light up when the DRL’s are off, not on. That way when I go to leave the CG, I get a lighted reminder to turn them back on. Is there a way to wire a rocker/toggle switch to work in this manner?

Thanks!

Craig
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Old 03-06-2012, 06:17 PM   #2
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If you are grounding 12 Volts to turn the DRLs on, put the light across the + and – terminals of the switch. When the switch is on, the + and – are shorted together and the light will go off. When off, the 12 volts goes thru the light to ground and lights.
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Old 03-06-2012, 07:15 PM   #3
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Quote:
Originally Posted by Dunner
If you are grounding 12 Volts to turn the DRLs on, put the light across the + and – terminals of the switch. When the switch is on, the + and – are shorted together and the light will go off. When off, the 12 volts goes thru the light to ground and lights.
I'm a little confused. I plan to use a rocker switch with a built in indicator light, so I'm not sure what you mean by, "put the light across the + and - terminals of the switch". Are you referring to the light of the switch, or the DRL's.

Sorry...I'm a little slow...

Thanks.

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Old 03-06-2012, 07:22 PM   #4
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You might have to take a small screwdriver and pry the switch apart to see how the switch light is wired and change it so the switch light wires are across the + and – terminals.
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Old 03-06-2012, 07:33 PM   #5
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You might have to take a small screwdriver and pry the switch apart to see how the switch light is wired and change it so the switch light wires are across the + and – terminals.
Oh, I see what you are saying. In that case then, it might be a better idea to install an indicator light separate from the switch.

Thanks Dunner.

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Old 03-06-2012, 07:41 PM   #6
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That would be easier as some switches don't like screwdrivers poked into them.
Try what I suggested before drilling holes. You could actually put the light any place you want it. It would only need very thin wires, 22-24 gauge.
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Old 03-06-2012, 07:50 PM   #7
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You could install a 12v relay that is open when 12v is applied and closed when power is off. This would work with a switch with a built in light indicator. I would turn it upside down.
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Old 03-06-2012, 08:04 PM   #8
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Craig,

I don't have an answer for wiring your switch to disable the DRL on your coach, however on my coach the DRL remain off as long as the parking brake is on. When maneuvering in campgrounds at night or early AM, I leave the park brake on a couple of clicks the lights remain off, and the park brake is not really engaged . The park brake warning light reminds me to release the parking brake which then turns on the DRLs when I am ready for them.
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Old 03-06-2012, 08:21 PM   #9
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Quote:
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You could install a 12v relay that is open when 12v is applied and closed when power is off. This would work with a switch with a built in light indicator. I would turn it upside down.
Turn what upside down? The motorhome?
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Old 03-06-2012, 08:27 PM   #10
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Turn what upside down? The motorhome?
Yes then the switch would be off in the up posistion with the lights on. May be simpler to just flip the switch.
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Old 03-06-2012, 08:52 PM   #11
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Quote:
Originally Posted by dieselclacker
I leave the park brake on a couple of clicks the lights remain off, and the park brake is not really engaged
I'm afraid that won't work on my DP. There are no clicks with my air parking brake. It's either fully on or off.

Thanks anyway.

Craig
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Old 03-06-2012, 08:55 PM   #12
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Quote:
Originally Posted by TAZ
You could install a 12v relay that is open when 12v is applied and closed when power is off. This would work with a switch with a built in light indicator. I would turn it upside down.
Another good idea. Thanks Taz.

Craig
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Old 03-07-2012, 07:49 AM   #13
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Do your DRL stay on or go off when you turn on the parking lights? I would think you could just turn the lights to parking and the DRL would go off.
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Old 03-07-2012, 08:33 AM   #14
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Quote:
Originally Posted by Doug Sage
Do your DRL stay on or go off when you turn on the parking lights? I would think you could just turn the lights to parking and the DRL would go off.
They are not affected by the parking lights...they come on when the parking brake is released regardless of anything else. This also makes it impossible to give other drivers a courtesy dim of the headlights at night, when they want to change lanes in front of me. This switch will cure that as well.
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