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Old 07-11-2015, 05:46 PM   #1
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beaumont , Texas
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tripping breakers

Hello all.. I have a 75 international, new PD converter, one year old battery, one year old Dometic 13,500 air conditioning. I can run the a c while on shore power, and it will run for about an hour, then the breaker in the trailer trips. I have it on shore power all the time, and when I went to it today, the 12 volt side of the breaker had tripped. No, charging, no lights etc.Reset the breaker, and it stayed on. Could someone help with diagnosis? I am thinking weak or faulty breakers, but I am not the electrician. I did have the PD professionally installed. ( good buddy who is an electrician), he has done several of my trailers.
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Old 07-11-2015, 06:00 PM   #2
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breakers age. First option change to a new one. If that still fails get a clip on amp meter and read the current at the breaker. Breakers should be able to carry 80% of the stated value. If the current is higher than that make sure you don't have any other load on the breaker besides the AC
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Old 07-11-2015, 06:40 PM   #3
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I've got a similar problem. When i switch the step light on the breaker pops and the AC goes off. Getting ready to replace the step light fixture to see if that will solve the problem.
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Old 07-11-2015, 06:41 PM   #4
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breakers

First, thanks for the help.. I looked at your tow vehicle, how do you like the excursion? Is it a diesel? I am thinking of getting, one, I want 7.3 or 6.4, if I can afford it. Do you know a source for the breakers? i am sure they are some oddball kind, thanks again,
Richard
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Old 07-11-2015, 07:13 PM   #5
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breaker

Seem like this is a common problem . Does anybody know the type of breakers and where to get them? I have 2 20 amp, a 15 amp and a 30 amp for the box.
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Old 07-11-2015, 07:19 PM   #6
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Quote:
Originally Posted by Dixie722 View Post
First, thanks for the help.. I looked at your tow vehicle, how do you like the excursion? Is it a diesel? I am thinking of getting, one, I want 7.3 or 6.4, if I can afford it. Do you know a source for the breakers? i am sure they are some oddball kind, thanks again,
Richard
Do not get the 6.4 or the 6.0; the 7.3 and the 6.7 are fine, no problems. One suggestion when you are running your AC is to leave the cabinet door open where the breaker box is housed. On a real hot day, mine goes off too, but when I leave the door open, it doesn't.
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Old 07-11-2015, 07:29 PM   #7
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The two circuits on a 1" breaker get really hot when the air conditioner starts. Per the National Electric Code, a breaker should not carry a constant load that exceeds 20% of the breaker's capacity, or 16 amps on a 20 amp breaker.

I would suggest rearranging the breakers so that the air conditioner breaker has one side in free air inside the box. That would help it dissipate the heat generated.

Also make sure all the load wire screws on the breakers are torqued to the proper value. If they are loose, that creates more heat.
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Old 07-11-2015, 08:33 PM   #8
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breaker

You know, I never thought of the heat, It is definitely hot in the rear of the trailer, I think I will do both, leave the door open for a while, and re arrange, sounds like a good idea, I still want to change them out, due to age..
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