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Old 08-25-2016, 04:18 PM   #1
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Reverse Polarity Light

Having just read about reverse polarity lights, I am assuming that the light at the left rear side of the trailer above the water inlet is just such a light. How can I test it to see if it is working?
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Old 08-25-2016, 05:22 PM   #2
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Reverse Polarity Light

You are correct it is the reverse polarity light.
IMHO you should disconnect it. But if you want to test it you need to reverse the hot and neutral in the panel. The light is wired between the neutral and earth ground. So if the hot and neutral are reversed the light will come on. But only if the bulb is good.
There are testers out in the market place that plug into a standard duplex outlet in your coach that will give you much more info on whether the wiring is correct.
I believe the price of these testers is less than $10.
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Old 08-25-2016, 07:27 PM   #3
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Originally Posted by TG Twinkie View Post
So if the hot and neutral are reversed the light will come on. But only if the bulb is good.
So really I just need to test the bulb. Thanks
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Old 08-25-2016, 08:15 PM   #4
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I think that the reverse polarity light is a cool feature

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Originally Posted by TG Twinkie View Post
You are correct it is the reverse polarity light.
IMHO you should disconnect it.
I am curious as to why you would advise to disconnect it. I'm shocked !!

I dry camp. I have only stayed at two campgrounds, one of which where the warning light came in handy, and saved me from getting shocked.

Another time at a " farm party " I daisy chained on to my friends camper. My friends extension cord was bad and my daughter was barefoot and got shocked when she tried to open the camper door.
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Old 08-27-2016, 08:10 AM   #5
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I am curious as to why you would advise to disconnect it.
The reverse polarity light could provide a path to energize the frame if polarity is reversed. It's better than nothing, but there are better solutions for ensuring safe power.

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I'm shocked!
I see what you did there.
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Old 08-27-2016, 09:10 AM   #6
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The reverse polarity light could provide a path to energize the frame if polarity is reversed. It's better than nothing, but there are better solutions for ensuring safe power.
Can you give some examples
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Old 08-27-2016, 10:38 AM   #7
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a better option for $5-$10, available at most hardware stores.
I leave mine plugged in 100% of the time when on shore power. It also is a pretty good night light.
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Old 08-27-2016, 11:29 AM   #8
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Can you give some examples
The whole mode of operation is to provide a path from the neutral leg to the frame through a bulb. Energize the neutral leg, the energy travels through the bulb to the frame, i.e. energizing the frame. Probably not dangerous since the bulb provides some resistance, but again, there are better solutions available.
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Old 08-27-2016, 11:30 AM   #9
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I prefer the non-contact voltage detectors which tell you immediately if the polarity is switched and has energized the trailer skin or frame. Here is the link to a $10 one from Sears I bought for our local club: [URL="http://www.sears.com/craftsman-voltage-detector/p-03482174000P?sid=IDx01192011x000001&gclid=Cj0KEQjw 9IS-BRC4qZXagbLs6uMBEiQAYHBh-xFaOH3o9hVRiCMKuwUwkqixvcoWfkdHpK5Edy8zcWMaAveC8P8 HAQ&gclsrc=aw.ds"]
Similar devices are available $10-$20. Better safe than sorry.
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Old 08-27-2016, 11:31 AM   #10
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Progressive dynamics EMS comes to mind. I have the hardwired 30amp version. Won't allow power to the coach with reversed polarity, along with a laundry list of other power problems.
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Old 08-27-2016, 12:40 PM   #11
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It is not a bulb... its a neon capsule.
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Old 08-27-2016, 04:15 PM   #12
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It is not a bulb... its a neon capsule.
Does it ever burn out
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Old 08-27-2016, 10:33 PM   #13
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Neon bulbs don't usually burnout, but the do get dim overtime


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Old 08-28-2016, 04:11 AM   #14
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The only way to reliably test a neon capsule is to energize it with 110 volts AC. It is best to unsolder it, test it, and reinstall it in the circuit. I do not recommend reversing the trailer input power. This can pose a potential danger to some equipment and personnel.
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