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  #1  
Old 08-20-2013, 01:15 PM
topspin topspin is offline
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Default 2009 3500 wiring, adding constant relay , need key-on source

Hi guys - 2009 Dodge Ram 3500 diesel. I'm adding a 12v constant duty relay to supply power to a camper setup. I found a place to mount the constant relay and now I'm looking for a source for the "key is on" 12v to activate the relay. The coil of the relay is 14 ohms so I believe I will only pull about 1 amp or so. What is the easiest circuit to access that can carry an extra 1 amp or so?

Thanks in advance..........Wallace.
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Old 08-20-2013, 01:17 PM
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Depending on where you put your switch the easiest place would be the 12v accessorie plug nearest the driver. The one nearest the driver is a key on plug and the one on the passenger side is a constant on. Should handle 3-5 amps just fine.
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Old 08-20-2013, 02:21 PM
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Yes...thanks! That is one straight forward enough idea...didn't realize one accessory 12v was key-on as I am not the truck owner. I mounted the relay driver side under the hood very near the battery (dual battery setup on this diesel) and near the hood supports. I don't have a wiring schematic but I would guess the accessory plug in the cabin is being serviced from the power distribution box very near this location as well...anyone know a wire color/location under the hood for the accessory plug? I could easily check continuity to be sure before splicing in. Thanks again for the good idea...
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Old 08-20-2013, 03:34 PM
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I am pretty sure its red with a green stripe....but please dont quote me on that.
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