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Old 03-31-2015, 03:10 PM   #1
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Electrical Shorting out and tripping house Breakers

This has me stumped. First off, let me explain up front that I am new to this TT world and so I am on a fast track of learning. I purchased a 2006 Sierra Toyhauler 26fbsp used from a dealer. Trailer is 30 amp out to house. It has a twist lock power cable which I have plugged into the trailer and connected a "beefy" extension cord and 110 adapter to plug into my home. POP, the Circuit trips at my house. Try another outlet different circuit, POP same thing. Different extention cable. Same result. Different 110 adapter. Same result. Take it back to dealer, use his outlet my cables, same issue. Use his cable (he has the ground cut off his extention cable) does not trip. I go back to my house and use a 3-2 prong adapter, circuit does not pop... WHAT??
Go down to Home D. and ask some questions. They stated it is because of one of two issues:

1) Trailer is not grounded properly causing an short. If this is the case, I have no clue where to start looking.
2) The ground and Common in my house breaker are connected which could be tripping the circuit when plugged into my trailer. which also points to a possible issue with the ground on my trailer.

What am I doing wrong??

Details to help reduce thread churn...
1) Trailer has two 6 volt batteries
2) The circuit trips at the house with the battery bypass in the on and off position
3) I am not a professional electrician nor an experienced TT person, but with enough detail and a follow-up question, I can answer or do what is described
4) the house circuits are 15 amp
5) My spelling skills are horrible so please excuse any brevity in my posts...
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Old 03-31-2015, 03:28 PM   #2
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Could be a couple of things. First of all you are plugging a 30A TT into a 15 amp service. You can do that if nothing is on in the TT but a few lights. . I would suggest ( especially since you are running an extension cord) you have an electrician add a 30A circuit and plug to the outside of the house. Also check to insure that you did not have the water heater (electric) switch on. If you did and the WH was not full, you burned up the heating element. This will trip a house GFI . It is very easy to draw over 15A. Try turning every breaker in the TT off and then try plugging in again. Then try turning one at a time on ( others off) this will determine what is causing the draw. Something was lft on.
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Old 03-31-2015, 03:29 PM   #3
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I would go back to the dealer and have them fix the problem. They cannot use a non grounded cord to check the TT. They have sold a trailer that is not safe if it has a ground problem. It could mean that you or another person could be electrocuted if the proper conditions were to happen.
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Old 03-31-2015, 03:34 PM   #4
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I would go back to the dealer and have them fix the problem. They cannot use a non grounded cord to check the TT. They have sold a trailer that is not safe if it has a ground problem. It could mean that you or another person could be electrocuted if the proper conditions were to happen.
Yep. I would even go so far as to say that if they are using a cord without a ground they KNOW there is a problem and are trying to pull a fast one. Any RV dealer that has any sense at all KNOWS that a trailer must be grounded. There is NO reason they would be using a connection without ground unless they have an agenda. I'd be jumping down someones throat over it. Just my .02.
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Old 03-31-2015, 04:11 PM   #5
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These are all good items. I have been working with the dealer, but I needed to confirm what was tripping the breaker before I approached the dealer again. I will also work to confirm the heater as it is a dual gas/electric heater on this unit. I will also trip the breakers to see if I can isolate what circuit(s) are causing the issue.
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Old 03-31-2015, 04:16 PM   #6
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Originally Posted by caper View Post
I would go back to the dealer and have them fix the problem. They cannot use a non grounded cord to check the TT. They have sold a trailer that is not safe if it has a ground problem. It could mean that you or another person could be electrocuted if the proper conditions were to happen.
I totally agree!

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Old 03-31-2015, 06:20 PM   #7
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If the TT has an electric hot water heater. Make sure it is in the off position when trying to hook to house.
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Old 03-31-2015, 07:15 PM   #8
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Wonder if it has been wired for generator use by 'floating the ground ' in the trailer.
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Old 04-01-2015, 10:11 AM   #9
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Wonder if it has been wired for generator use by 'floating the ground ' in the trailer.
I am not familiar with Floating the Ground. Can you explain?
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Old 04-01-2015, 10:13 AM   #10
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I would go back to the dealer and have them fix the problem. They cannot use a non grounded cord to check the TT. They have sold a trailer that is not safe if it has a ground problem. It could mean that you or another person could be electrocuted if the proper conditions were to happen.
The dealer has been great. They have commited to fix the issue and put me on the books for two weeks in the future. I only wish I could have figured it out...
I dislike not being able to find a root cause....
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