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Old 06-17-2010, 09:48 AM   #1
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135 volts+ at electrical outlet

I own a 1996 Airstream Land Yacht 30 which has not been used for 2 years. I'm getting it ready to go and I have a problem with ac voltage. The outlet behind the passenger chair show it's outting out 135 volts +, all other electrical outs show no power. Have power to roof air. Where do I start looking to find the problem?
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Old 06-17-2010, 09:55 AM   #2
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First, check your input voltage. It should be in the 115 _+ 5 volts depending on your house voltage. Also calibrate your volt meter if you can.
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Old 06-17-2010, 10:14 AM   #3
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Depending on the type, fresh batteries in the VOM so it has a clean reference voltage can be very important. Secondly - which type of 120VAC lines are you checking, are they from a generator or shore power?
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Old 06-17-2010, 10:38 AM   #4
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Loss of voltage to the outlets...

Check all the breakers at the main power panel also check the GFCI (I think it may be in the bathroom). The GFCI is tied to several outlets but not the AC.

If you are running an Inverter check the breakers on the inverter.

135VAC.... Check your meter. Are you getting power from the house or generator?
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Old 06-17-2010, 10:56 AM   #5
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You may have a bad ground and the neutral is above gnd. Check the hot lead to the frame of trailer, Then check the neutral lead to the frame. The neutral lead should have 0 volts and hot lead 115 VAC.

Neutral leade may be corroded in the power box. Neutral is normally transformer coupled to gnd at the source. Bad grounds and neutral connections will provide path for stray voltage when measuring AC.

Plug a light into outlet and see if you still have power.
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Old 06-17-2010, 11:07 AM   #6
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First, check your input voltage. It should be in the 115 _+ 5 volts depending on your house voltage. Also calibrate your volt meter if you can.
Voltage varies considerably throughout the day and from place to place and many voltage meters are inaccurate and inconsistent. The voltage in my house is usually between 124 and 126, and there's nothing unusual about that.

The important thing for trailer wiring is that the voltage in the trailer should be the same as the voltage at the shore power connection. Check that. If the voltage is high at the shore power connection, you can address that or not as you see fit, though it may well be a problem with the meter.
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Old 06-17-2010, 11:28 AM   #7
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I'm getting the reading while plugged into shore power. The meter I'm using is not adjustable it's one of those plug in units with an analog meter and only shows 110 - 135 volts.
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Old 06-17-2010, 01:22 PM   #8
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I'm getting the reading while plugged into shore power. The meter I'm using is not adjustable it's one of those plug in units with an analog meter and only shows 110 - 135 volts.
I had one of those plug in units, they're pretty much useless. Get yourself a good multi-meter instead. An advantage of having a good multi-meter is you can use it to troubleshoot all of your electrical system.

BTW - The one I had would peg to the top of the scale and my DMM showed 115VAC - I trust my DMM...
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Old 06-17-2010, 04:11 PM   #9
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I have one of the plug-in units and it's highly susceptible to accumulating static from handling, and that's enough to push the needle around and give false readings.

They're fine if you don't touch them, or if you have a piece of Polonium to wave over them once in a while.
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Old 06-17-2010, 04:17 PM   #10
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... or if you have a piece of Polonium to wave over them once in a while.
Ya know, I didn't find that comment very helpful. If it was supposed to be a joke, think about using a smilie or something.

Tom
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Old 06-17-2010, 09:55 PM   #11
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Actually that is an old photographers helper - they had special brushes with certain heavy metals isotopes that neutralized static on 'no touch' items like negatives - they had a definite life span and became useless in a few years since the quantities involved were soooo small.
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Old 06-17-2010, 11:57 PM   #12
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Ya know, I didn't find that comment very helpful. If it was supposed to be a joke, think about using a smilie or something.

Tom
No joke. You can buy polonium static neutralizing devices from a variety of sources. The negative brushes Wabbiteer mentions are but one of them.

There is no means of rapidly dissipating the static accumulated in one of these devices other than exposing it to radiation.

I'm not making this stuff up.
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