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Old 06-22-2015, 01:12 PM   #11
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I've often wondered the same thing. If you hook up a 50A MH to a 30A service, are you getting 15A on each leg or are you getting 30A on a single leg and nothing on the secondary leg. Anyone know the answer?
Using the proper adapter, you will share the 30 amps across both legs of the 50 amp.

Here is another thread that also has schematic of the way 30 and 50 amp RV's are wired, along with how the adapter uses a L1 "jumper" across both legs (L1 and L2) of the 50 amp.

30M to 50F dog bone adapter problems
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Old 06-23-2015, 09:19 AM   #12
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drove to the campsite and plugged into 50 amp service. same thing, one leg is dead. so my multimeter, screwdriver and I spent some time dissecting the trailer. started and distribution panel and works back towards the power pedestal. finally found out that the is no power on one leg coming out of the surge protector (brand new progressive industries 50 amp hardwired). yet the display unit shows an input voltage of 117 on both legs. I had this unit installed by camping world a month ago and this is the first time we have used the trailer since. so I called camping world and have to take the trailer back and they will look at it. (in a week)!
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Old 06-23-2015, 10:00 AM   #13
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OK - I have th exact same surge protector, except I installed it myself. Here's what you want to do:

1. Unplug from the power pole and turn off your generator (assuming you have autostart, you may want to flip the switch on the generator so it doesn't come on automatically).

2. Remove the cover of the surge protector. Inside, you'll see the card with the display on it. This just slips off the connector and it will allow you to see the actual relay in the rear of the device. One side is wiring coming from the shore power and the other side goes to the coach.

3. Check the connections at this relay. The two outer connections on each side are the hot lines. You'll probably find that CW (as usual) failed to tighten one of the four connections (two on each side of the relay) and you've lost power there.

4. If you don't find a loose wire, check voltage on each side of the relay. The center wire is the common.

5. If you find you have power on both sides, call Progressive Industries. Their techs are great. Tell them you have an emergency and are stuck at the campground. They'll step you through a couple of tests and, if the device is bad, they'll send you a new one. They have a lifetime warranty. They will also most likely be able to tell you how to jump around the relay to get things going again.

6. If all else fails, you can remove the wiring from the shore power side of the device, disconnect the device cord from your ATS and hook the shore power directly to the ATS. That's how it came from the factory. Sounds like more work than it really is. Just be SURE all power is OFF first!

Hope this helps. Good luck.
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Old 06-24-2015, 10:02 PM   #14
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to all, thank you! finally got it today. I contorted myself to get to where I could open the cover of the surge protector. verified incoming voltage on both legs was 117 yet only got 117 on one output leg. so called progressive and spoke to a guy named dan. he told me to remove another cover and tell him what I saw. there was a piece of plastic in the cavity where the output neutral contactor was. he said this was not right and to remove it. I did and we tried the unit and it worked. that piece of plastic was from the small cover he told me to remove and in looking at the cover it was obvious that another piece had broken off that would have been over the output leg that had no power. I found a second piece of plastic on the bottom of the unit. my guess the camping world tech just forced this cover on and the plastic pieces broke off and fell into the contactor cavities and interfered with them. opening up the cover probably allowed the piece to fall out of the contactor so that now it works. bottom line, we now have both legs of power and can run both a/c's. it's about 100 here today!
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Old 06-24-2015, 10:05 PM   #15
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Glad you got it going! The PI folks are great. Caw....that's another story!
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Old 06-24-2015, 10:16 PM   #16
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My explanation on that was rather dumb.....thanks for clarifying. What I was trying to ask was if both legs on the 50A would be hot or if only one of them would be hot. I'm not real swift on electrical - obviously.
Don't feel bad and there are no dumb questions. I have delt with both house and automotive electrical systems most of my adult years (and that's a long time) but 3 years ago when I got into RV'ing I was right here on this forum learning the differences same as you, RV electrical can be confusing until the little lite comes on and then we are all prone to go 'Now why didn't I see that right off'. Have a great day and camp, camp, camp enjoy.
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Old 06-29-2015, 10:06 PM   #17
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2015 Forester cannot figure out the electrical

Frig works, levelers work, fan worls, but no microwave and the plugs do not work, thus instant coffee this am... 2nd day on our adventure, still trying to figure it out, manual is no help..... help
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Old 06-29-2015, 10:07 PM   #18
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oh and we are dry camping.... calle for help saif to check circut breakers and also discovered AC will not come on.
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Old 06-29-2015, 10:15 PM   #19
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Assuming you have a gas fridge, it sounds like everything not working is 110v. Have you checked that breaker? You said you're dry camping. Are you on shore power or generator?
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Old 06-29-2015, 10:29 PM   #20
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generator on, no circuit breakers blown, i must be missing switch some where ? but where ?
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