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Old 06-11-2016, 12:29 PM   #1
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Question with some electronics, electrical knowledge required..

What im trying to do is setup a PIR sensor that would turn on my trailers marker lights. Some people use a fuse thats inserted into the 7way plug to turn these on. Now, if i was to run a pir sensor (off my battery) that would trigger a relay or a contactor and put a short between the two terminals in the plug?
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Old 06-11-2016, 12:43 PM   #2
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So I take it you are trying to use the passive infrared sensor as a motion sensor to turn on your running lights if someone comes near your RV at night...maybe to scare them away or alert you?

What about animals/critters?

The fuse you talk about inserting into your 7 way, just connects the positive 12 volt from your battery to the running lights, hence powers them on.

You couldn't just perhaps do the same. and wire the PIR to a female plug that your could plug into your RV's 7-way...that would get power from the 12 v+ and connect it to the running lights when the motion sensor called for it? The PIR you have listed is 12 volt too, so no need for a relay in my opinion.
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Old 06-11-2016, 12:53 PM   #3
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Without the relay/contactor? Yeahh, that might be simpler. Im seasonal 90% of the time, hooked up all the time to the post. Im only here for the weekends. Last week there was a brake in and tv etc was stolen. I already have the starlight, but i think all the running lights coming on would bring more attention. They are all leds so im not concerned with the amp draw
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Old 06-11-2016, 01:00 PM   #4
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What I mean is this, according to the spec sheet you have above, the PIR sensor has brown wire to neutral, a blue wire to live input, and a red wire to live output.

If you purchased just a 7 pin female (like on your truck, right hand side of the pic below), then your would wire the PIR sensor to the

sensors brown wire to the #1 white of the blade end

sensors blue wire to the #4 black of the blade end

sensors red wire to the #3 brown of the blade end

Then all you do is plug your RV into the female end and all is connected. When you don't want the sensor, you just unplug it and store the blade end somewhere.

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Old 06-11-2016, 01:03 PM   #5
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What you want is very easy to do , but not sure of the value. Just search for 12V PIR sensor and you can find several for < $15. Problem is it may draw your battery down if not connected to shore power and there are lots of animals. You can also find very inexpensive 110V motion sensor lights.
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Old 06-11-2016, 01:12 PM   #6
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Already have the female connector. The sensor i found is 6$. I would like this to be "mobile" for future. Next week i will be adding two semiflexible solar panels (200w) and one more battery.
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Old 06-11-2016, 01:13 PM   #7
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Old 06-11-2016, 06:26 PM   #8
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Quote:
Originally Posted by Kuba View Post
Already have the female connector. The sensor i found is 6$. I would like this to be "mobile" for future. Next week i will be adding two semiflexible solar panels (200w) and one more battery.
Good deal. It already has exposed wiring that you can just splice the sensors 3 wires into like I stated above., then connect it to your trailer. It'll get the power from the RV's battery. Remove it when you don't want IR/motion activated night lights. Can't get more portable than that.

Let us know how this works out, as you got me curious now.
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Old 10-09-2016, 06:09 PM   #9
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Forgot to update. It works pretty well. 20-30 feet range. All my running lights go on, they are Led
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Old 10-09-2016, 06:14 PM   #10
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Sensor right under the front corner. I screwed the female end/receptacle to the frame
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