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Old 04-24-2013, 05:14 AM   #1
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Reversed batteries and furnace

We were camping with friends on the weekend. They had just de-winterized their TT and had the batteries out over the winter. We kept smelling a rotten egg smell and thought that it was a leaking sewer connection under or near our TTs. Then we heard a repetitive clicking sound and discovered that it was the circuit breaker near the batteries on the tongue cycling on and off. It was then that we discovered that their batteries got reversed.

Everything seems to work fine after fixing the polarity except the furnace. It would not work for anything. We took it out with the thought of taking it to a repair shop. I would think it would have to be a blown control module?

I just realized that we didn't check the fuse... Their TT is being stored in a spot that is not nearby to run to and check it. However, is reversed polarity likely to cause a blown control module? Am wondering of the continual on/off cycling of the breaker caused damaging spikes perhaps? Fortunately a new module is not that expensive to get one off ebay or Amazon.

Are the batteries going to be okay? They were rather warm to the touch and the electrolyte level seemed a bit low. I'm not sure how the circuit breakers are supposed to work. Should they reset automatically? I would have thought they stay off if tripped?
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Old 04-24-2013, 09:58 AM   #2
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Had a neighbour do the same thing in his 5th wheel , circuit board in the furnace failed, imediately, then over the winter the digital t'stat failed , then in the spring the a/c wouldn't work. Every electronic control has been effected, when they fail.... . If the convertor was trying to reverse charge the battery it may be in trouble too.
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Old 04-24-2013, 08:09 PM   #3
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I would think that fuses and circuit breakers acted normally and protected things.
What was the furnace doing?
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Old 04-25-2013, 12:18 AM   #4
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The furnace was dead as dead can be. I remembered after the above post that we did indeed check the fuse and it was okay. The A/C, fridge, water heater and anything else that might have been affected are okay.
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Old 04-25-2013, 07:13 PM   #5
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Is there power getting to furnace at all?
That'd be the first place to check. Should be red, yellow, blue and blue coming into it. Red is, hot, yellow is negative.
After that, it there's power, just have to follow the path and see where it stops.
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