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Old 08-06-2014, 07:27 PM   #1
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Power problems...

We've got the trailer in the driveway, and we can't seem to get around a low voltage problem.

My friend who is an industrial electrician, ran a line from my residential fuse box to a 30a weatherproof RV plug. The same type of plug you'd find on a pole at a campsite.

When we plugged the trailer in we were able to run the A/C, and one light. If we turned on a second light the LP/Low Voltage detector turns red and beeps very loudly. The lights also dim.

We found that the fuse box was not properly grounded and we had 101.8 milliamps going to ground. After properly grounding the fuse box, we found that we had .9 going to ground, and we were getting 122.8 volts at the fuse panel.

So we plugged in the trailer again, and again same thing. We can run the A/C and one light, but two lights makes it dim and the LP/Low Voltage detector turns red and beeps very loudly.

Then we though that the polarity in the plug, and the receptacle were reversed, so we change the receptal around. Plugged the trailer back in and, same thing. One light and the A/C ok, but two or more lights is dim and the beep.

When we looked at the trailer it was plugged in and the A/C was running, and we flipped all the lights on and off and everything, and never got the beeping.

In addition, there is no gas running to the trailer at this time.

Any other suggestions or thoughts as to the problem?
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Old 08-06-2014, 07:28 PM   #2
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BTW... he used direct burial cable thats rated at up to 80amps, and we only ran a line about 30 feet from the fuse box.
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Old 08-06-2014, 07:32 PM   #3
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Sounds to me like you need to do some reading first to make sure that the electrical supply to the receptacle that you are using is wired CORRECTLY.

RV Electric

Then test to see what you have going on with your power, etc. and report back.

Dr4Film ----- Richard
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Old 08-06-2014, 07:34 PM   #4
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Quote:
Originally Posted by Dr4Film View Post
Sounds to me like you need to do some reading first to make sure that the electrical supply to the receptacle that you are using is wired CORRECTLY.

RV Electric

Then test to see what you have going on with your power, etc. and report back.

Dr4Film ----- Richard


He's an industrial electrician. I'm pretty sure he knows how to hook everything up... if thats what you are insinuating.
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Old 08-06-2014, 07:52 PM   #5
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Power problems...

What is confusing is when you say turning on a second light seems to cause a problem. Aren't all the lights 12v and run off your onboard battery? What type of converter/charger do you have?

Can you measure the voltage in the coach? What does it read?
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Old 08-06-2014, 07:58 PM   #6
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Having one of these would benefit you, and help in diagnosing power problems like this.

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Old 08-06-2014, 08:10 PM   #7
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Low battery voltage. Let your batteries charge fully and then turn on your lights.
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Old 08-06-2014, 08:22 PM   #8
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Low battery voltage. Let your batteries charge fully and then turn on your lights.
There are no batteries connected on this trailer at this time.

We are running direction from the plug.
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Old 08-06-2014, 08:24 PM   #9
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What is confusing is when you say turning on a second light seems to cause a problem. Aren't all the lights 12v and run off your onboard battery? What type of converter/charger do you have?

Can you measure the voltage in the coach? What does it read?

He ran his fluke meter through all of the fuses on the converter and he was getting 121-122 volts. If I remember correctly they were mostly 121.6
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Old 08-06-2014, 08:28 PM   #10
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This is the converter
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Old 08-06-2014, 08:29 PM   #11
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The inside
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Old 08-06-2014, 08:30 PM   #12
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Your converter is not putting out the 12 VDC power that you are needing and expecting for the additional lights.

Some RV's will work OK without any battery connected whereas others require a 12 VDC battery hooked to the converter.

Dr4Film ----- Richard
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Old 08-06-2014, 08:31 PM   #13
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And this is the thing that beeps ridiculously loud when you turn on two or more lights. It chirps, beeps, and the lights go red.
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Old 08-06-2014, 08:34 PM   #14
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Your converter is not putting out the 12 VDC power that you are needing and expecting for the additional lights.

Some RV's will work OK without any battery connected whereas others require a 12 VDC battery hooked to the converter.

Dr4Film ----- Richard

The odd thing is that the previous owners had this trailer hooked up, with the A/C running, the fridge on, and there wasn't any beeping. And we were both in there turning on lights and fans and the microwave and radio... and it didn't do this where he had it plugged in. And there wasn't any battery connected then either.
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