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Old 06-22-2015, 11:11 AM   #29
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DC Short? Odd Tingling on Door Frame

I guarantee that a person can feel a 12 volt battery under the right conditions, sweat will improve conduction to the point that completing a circuit even with a single battery is uncomfortable. (I.e. Laying a sweat soaked arm across a battery cable terminal while being well grounded to the chassis)

I would imagine that a bank of batteries could be very uncomfortable indeed.

I am thinking that this incident has more to do with radiation or induction though. (As mentioned above)
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Old 06-22-2015, 11:20 AM   #30
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This is my first reply to many hours of thought provoking forum "moments".
I have had similar episodes on my boat when pulling up the anchor chain with the 12v windlass. The chain serves as a ground as does the propeller shaft. By stepping on the trailer step with a wet foot on the ground you are also a ground as is the trailer hitch's connection to the trailer. The tires may serve to protect you as well as serve to result in you being the only connection to the "ground" when you connect the trailer to the "earth ground". The "ground" connection between your car and/or trailer and/or AC sources may not be as large as the "ground connection" between you and the "ground". Therefore, you may become the primary ground.
I was told that to detect a grounding problems you can use an AM radio set on a "low" number station. Static in the radio may represent a nearby ground problem. I am not sure that this information is correct but it seems to work out for me.
Thank you for all the hours of enjoyment I have had with this Forum.
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Old 06-22-2015, 11:34 AM   #31
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That was me . We would get a hard shock not a little tingle . It was funny watchin us all do the door test before entering . No univolt and problem solved. I would check your ground wires.
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Old 06-22-2015, 01:51 PM   #32
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Hint....
When "testing" the "hot RV skin" condition, only "bump" or "graze" with the BACK of your hand... If there is enough power and a good ground, your hand could go into "clamping" condition and you may "ride the lightning"...

That would be bad because the resulting burning would damage the Airstream coating.
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Old 06-22-2015, 05:33 PM   #33
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Here's another clue that I just thought of - I had two aluminum painter poles in a flag mounting bracket at the time. Both pointing skyward, perhaps 20-30 feet from the power lines (well below them). Could this have increased the radiation/ induction effect?
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Old 06-22-2015, 08:25 PM   #34
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It all depends on the voltage on the power lines. If you were under 16,000 you could have drawn an arc to those poles. but since you are still here it must have been a lesser voltage.

Use an AC meter to test the voltage. Those are all interesting stories about shocks form a DC circuit but not a likely reason based on what you have posted.
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Old 06-22-2015, 08:53 PM   #35
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Jim ,Teach & Lucille here. My shock only came when I was hooked up to house 120 vt. Maybe a ground in ground might help. Please keep posting as I'll keep checking back. The shock blast didn't hurt but know something isn't right!
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Old 06-22-2015, 08:58 PM   #36
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Us again. Used a generator two weekend's ago. Don't remember any electrical blast?
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Old 06-23-2015, 07:34 AM   #37
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Jim ,Teach & Lucille here. My shock only came when I was hooked up to house 120 vt. Maybe a ground in ground might help. Please keep posting as I'll keep checking back. The shock blast didn't hurt but know something isn't right!
If you got a shock at your house have the problem at the house fixed before you kill someone. More than likely No ground at the receptacle.
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Old 06-24-2015, 06:36 PM   #38
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Took your advice. Have one of the plug in gizmos to let you know if you wired things right. Double "Yellow". All good there. Any suggestions?
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Old 06-24-2015, 06:44 PM   #39
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Sorry things are good at house end just when a I was working on trailer sweaty was when I felt the "buzz".
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Old 06-24-2015, 07:18 PM   #40
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Did you plug the tester into EVERY receptacle in the trailer or just test one.
Are you measuring any voltage from the trailer to ground? Use the ground terminal on an extension cord from a Good receptacle in the house as ground.

If you measure voltage there start unplugging things in the trailer till the voltage drops. That last thing unplugged may be your problem.
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Old 06-25-2015, 11:37 AM   #41
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Sorry things are good at house end just when a I was working on trailer sweaty was when I felt the "buzz".
Plugging into the house establishes (assuming the house safety ground system is intact) the trailer frame potential as the potential at the ground rod where the power enters the house. There are many reasons why the potential of the ground at the trailer might be different. Even if there are no faults in the trailer, you could have a potential difference of several volts. Since you are getting the tingle when placing yourself between the trailer skin/frame and the ground near the trailer, you should make voltage measurements to the ground there, not to the green wire.

I still go back to your original post that said you were getting the tingle with shore power disconnected. In order for that to happen, there must be another connection from the trailer to the ground. Without that, any voltage generated on the trailer has no reference to ground and will not cause a tingle. If you don't believe this, put two cars side by side. Measure from the positive post of one car's battery to the negative post of the other car's battery. You will read 0 volts. The most likely ground references are the tongue jack and the TV cable connection. IF you were connected to a campground TV cable system, it's coax shield could have a voltage difference to ground and you might feel that.

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Old 06-25-2015, 05:43 PM   #42
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Thanks for everyones help. It will be a few days before I get Lucille home for more testing. More HA ha questions to follow.
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