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10-29-2017, 12:50 PM
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#1
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Member
Winnebago Owners Club
Join Date: Feb 2017
Posts: 40
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Will reversed polarity at the post hurt my RV?
Just arrived at a nice state park campground in my new Vista. I haven’t yet hooked up because th surge protector is indicating reversed polarity. Is this harmful to the coach? TIA for any help.
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10-29-2017, 12:53 PM
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#2
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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__________________
2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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10-29-2017, 12:59 PM
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#3
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Senior Member
Join Date: May 2017
Location: Metamora, MI
Posts: 5,525
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Since the RV is new, possibly it's the RV / surge protector that is wired backwards.
If you had a multimeter (and know how to safely use it), you can tell if the neutral is connected to ground (no voltage across) and that the hot is where the hot should be (has voltage when compared to ground (and neutral). This is 110volt (not 220) specific.
__________________
2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
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10-29-2017, 01:51 PM
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#4
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Member
Winnebago Owners Club
Join Date: Feb 2017
Posts: 40
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I only mentioned that it was new because I had read that some older coaches were wired differently. I know the RV and surge protector are OK, because I’ve been using both for about 10 months without problems. Further, I’ve checked other posts in campground and they read perfectly. The park host says someone pulled out earlier today and hadn’t reported problems. Naturally, the park is fully booked so there’s no other site to which to move. It’s going to get cold tonight and I’m not prepared to boondock. (Inadequate propane, and nearby vendors are closed on Sunday. Decisions, decisions.
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10-29-2017, 02:00 PM
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#5
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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The panel will have to come off your pedestal and see if there is 120v on the neutral wire.......or take a meter and check/test the incoming side of your surge protector to see what may be going on.
__________________
2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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10-29-2017, 02:30 PM
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#6
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Member
Winnebago Owners Club
Join Date: Feb 2017
Posts: 40
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Park maintenance came out and found an open ground and some voltage on the neutral wire. Replaced the receptacle, verified the proper connections and now we are all good, according to his Fluke multimeter and my surge protector. Kudos to Oklahoma State Parks (Beavers Bend, in particular) for prompt, courteous, and professional service.
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10-29-2017, 02:32 PM
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#7
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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Thank you for the update! glad it is fixed and you have power for your stay......Enjoy!
__________________
2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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10-29-2017, 02:33 PM
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#8
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Member
Winnebago Owners Club
Join Date: Feb 2017
Posts: 40
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Nonetheless, for future reference, what are the likely consequences of unknowingly plugging into a post with reversed polarity?
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10-29-2017, 02:35 PM
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#9
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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Read down through the link I posted in post #2.......it will tell you.
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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10-29-2017, 02:51 PM
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#10
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,559
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Glad you don't have to worry about the cold night. 
__________________
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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10-30-2017, 05:55 AM
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#11
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Jan 2017
Location: South Carolina
Posts: 353
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Quote:
Originally Posted by Cairnwalker
Park maintenance came out and found an open ground and some voltage on the neutral wire. Replaced the receptacle, verified the proper connections and now we are all good, according to his Fluke multimeter and my surge protector. Kudos to Oklahoma State Parks (Beavers Bend, in particular) for prompt, courteous, and professional service.
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Thanks for sharing your story. That is exactly why I installed a Progressive EMS surge protector in my Winni Vista 29VE! Good to hear your all fixed up.
Patrick
Semper Paratus
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Semper Paratus
KE4TQV
2017 Winnebago Vista 29VE
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10-30-2017, 08:11 AM
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#12
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Member
Winnebago Owners Club
Join Date: Feb 2017
Posts: 40
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Quote:
Originally Posted by palehorse89
Read down through the link I posted in post #2.......it will tell you.
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I very much appreciated the link. Indeed, very helpful in explaining the dangers, even on an appliance as simple as a lamp. I see so many RV’s connected directly to the power post without a surge protector that I cannot help but think that more than a few have hooked up to faulty wiring unknowingly. Even if things appear to ‘work ok’, and no one is hurt, I still wonder what the most likely potential damage to the coach might be, whether recognized immediately or not.
Inquiring minds want to know...
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10-30-2017, 08:21 AM
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#13
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Senior Member
Join Date: Dec 2013
Location: Plantation, Fl
Posts: 1,886
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Quote:
Originally Posted by Cairnwalker
I see so many RV’s connected directly to the power post without a surge protector that I cannot help but think that more than a few have hooked up to faulty wiring unknowingly.
Inquiring minds want to know...
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A lot of us have EMS units hard wired into our RVs, so you can't tell by looking at someone's power cord, if they do or don't have an EMS. 
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2024 Jayco Redhawk 26 M (OCCC challenged)
2017 RWD F 150 with a drive shaft disconnect
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10-30-2017, 08:32 AM
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#14
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Senior Member
Join Date: Feb 2009
Location: Hamilton, Indiana
Posts: 578
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Quote:
Originally Posted by palehorse89
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Even though I’m an engineer I thought that was a good article, thank you for sharing!
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2017 Thor Windsport 29M
Dave & Myra FMCA 101070S
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