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Old 02-23-2015, 06:12 AM   #15
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Originally Posted by rmkrum View Post
Problem is that most modern brake controllers use a solid state switch to power the brakes. Feeding voltage into the umbilical brake line can cause damage to that part of the controller and render it useless. Unplug it first for protection. And, as mentioned, you want to be sure the trailer batteries will power the brakes properly as well.

Correct. I blew out a cheap controller this way.
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Old 02-23-2015, 06:48 AM   #16
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Having a piece of equipment which does not meet code creates a liability issue one does not want to find themselves in if an accident occurs. Good idea to get it repaired.
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Old 06-03-2015, 09:50 AM   #17
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Tow break-away switch testing?

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Originally Posted by ghamr View Post
Is there a way and/or is it necessary to test the break-away switch that activates the AS breaks if the camper comes loose from the TV.
Later: Just read some of the posts below & seems my questions are answered.......

See the 2008 thread by John Barca (JBarca) on www.rv.net entitled

WD Safety Chains Hookup

for the relationship of chains and brake switch lengths.
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Old 06-03-2015, 10:43 AM   #18
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Originally Posted by silver 67 View Post
I have read that once you pull the pin you should not leave it out but a few minutes as it is sending a full12 volts to the brakes which can heat up and warp the hubs and other problems.
I accidentally pulled the pin on my break away switch and it was out for 3 days. I was hooked up, so no battery run down. No damage to the brakes, magnets or anything else at all.

The current is about 3 amps per brake, and at 12 volts that is around 36 watts. Considering the heat generated from actual braking going downhill etc, the 36 watts is nothing. The hubs certainly will not warp. The brake magnet adheres to a plate inside the wheel, not the drum or hub.

I certainly don't advocate pulling the pin and leaving it out, but no damage will occur if it is done.
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Old 06-03-2015, 10:57 AM   #19
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Quote:
Originally Posted by silver 67 View Post
I have read that once you pull the pin you should not leave it out but a few minutes as it is sending a full12 volts to the brakes which can heat up and warp the hubs and other problems.
If the trailer is not moving when the pin is pulled then there is no friction, only pressure, and thus no heat buildup.

Think of it like this: Rub your hands together. They get warmer because of the skin-on-skin friction. Now just press your hands together. They don't get warmer because there's no friction, only pressure. The brakes are the same way if you pull the breakaway pin.
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Old 06-03-2015, 11:57 AM   #20
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Just my humble opinion, but I think that a controller damaged by current backing into it is a poorly designed product that I would want off of my vehicle and replaced with a more practical devise.
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