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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 05-24-2010
Bluebird Bob's Avatar
Bluebird Bob Bluebird Bob is offline
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Default Electrical panel question

Hi group,
Here is my question.
In our 3 years of fulltiming I have run across this problem maybe 5 times.
Pull into a park, hookup electrical and the reverse polarity lights come on on the panel. Sometimes bright, somestimes dim.
I have had a Progressive surge protector (50A) and it didn't show a problem.
Upgrades to the new EMS protector which gives codes to tell if box is wired wrong.
Today, pulled into a part in York, Pa to see Gettysburg and Hershey and my EMS said everything fine. Red lights on panel were on very dimmly.
Is it possible after 26 years the electronics in the panel are weak and they don't mean anything since I have the EMS?
Anybody else have this situation?

Bob Lawrence
84 PT36
York, Pa.
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  #2  
Old 05-26-2010
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Ed Wimberley Ed Wimberley is offline
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Bob
Sorry for not answering sooner-been busy.
Yes some older electronics break down with age,they leak current in the boards and on surface of boards.Newer electronics are built better and MAY not have this problem with age-we'll see with time.
Meanwhile pull out the board and clean with circuit cleaner I get mine at Radio Shack.
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  #3  
Old 05-27-2010
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Thanks for the info Ed.
Will get to Radio Shack and get some.

Bob Lawrence
84 PT36
York, Pa.
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Old 05-27-2010
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Bob,
It is possible that the dim glow is caused by the neutral being at a slightly different voltage than the ground. Neutral and ground are tied togeather back at the campground main panel, but the neutral is a current carrying conductor and due to the load of other RV's and wire length it could be a couple of volts different than the ground at your hookup.

In my FC the polarity indicator circuit is made up of resistors and diodes (passive devices). These can age and fail, but generally they are pretty stable. The fact that it doesn't happen everywhere leads me to suspect the campground wiring rather than the detector in your coach.

ALso, cleaning the circuit board is a good idea, junk collects and can cause erroneous readings.
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86 PT-36 Golden Memories
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  #5  
Old 05-29-2010
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Thanks, Gardner.

What you said makes sense to me.
I will get cleaner from Shack when we get to Maine and I find a Shack there.
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