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Old 09-23-2013, 06:36 PM   #15
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A W Warn's Avatar

2000 25' Safari
1999 34' Excella
Davidson County, NC , Highlands County, FL
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Posts: 3,393
Originally Posted by Foiled Again View Post
YOU SHOULD BE FINE WITHOUT A BATTERY as long as you're hooked up. You DO need a battery when traveling to operate your 12 volt lights, and keep the control board of the fridge working.

Not exactly!
The tow vehicle supplies electrical power to charge the trailer house battery in the trailer, power for normal braking, and power for all vehicular & signal lighting. (using a separate protected circuit for each function provided from the tow vehicle)
While traveling, the trailer house battery is necessary to operate the fridge and interior lighting, as Paula stated.
The trailer house battery is required as a safety device to operate the emergency brake when the switch is activate in case the tow vehicle and trailer disconnect from each other while moving/towing.

2014 Silverado 1500 Crew Cab 5.3L maximum trailering package (yes, I'm towing the 34')
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Old 10-19-2013, 09:14 AM   #16
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Baltimore , Maryland
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Thank you all for the help. Disconnected the batteries and taped the leads. No difference in 12v issues. Again I did not have my tester so I could not tell voltage. So for sanity and sake of time, I'm going to replace the converter. As I mentioned earlier, it is a parallax 7355.

Are there others I should consider?

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Old 10-19-2013, 10:23 AM   #17
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2009 27' FB Flying Cloud
1991 35' Airstream 350
Jay , Oklahoma
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My guess is the rectifier in the converter failed. It is the part that changes AC into DC.

The transformer steps the 120 volts to 12 volts.

The converter is still making 12 volts, just not making smooth DC current.

If you intend to leave the trailer plugged into shore power all the time, then there is not much need to upgrade the converter. Just buy a new 7355 power supply and do a simple direct replacement.

There are converters out there that are more than a simple power supply. They add advanced battery charging circuitry that helps take better care of the batteries for those of us that move our trailers around and stay off shore power sometimes.

They don't do anything extra for a trailer that stays plugged in most the time. So, for a trailer that doesn't really need batteries, the effort required to change the converter and distribution board may not be worth it. A simple replacement of the factory equipment may be the simplest plan.



Jeff & Cindy
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'91 350 LE MH
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