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Old 05-13-2014, 09:09 PM   #1
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2012 Thor Ace 29.1 Chassis Battery

Hi,

I recently purchased a used 2012 Thor ACE 29.1 with only 4,000+ miles from a dealer in southern cal. After taking it out for the first time i noticed the unit wouldn't crank up all that well and figured the chassis battery needed to be checked. So I took it to an auto zone and sure enough the battery tested "BAD BATTERY." Interestingly, I noticed that the chassis battery was an Interstate battery and not the Motorcraft battery that comes new with the unit from factory. I thought it was odd that a 2012 unit with only 4,000+ miles would need to go on it's third battery. Has any one else had any problems with their chassis batteries.

Additionally, I'm also kind of concerned because as I've been using the RV i've noticed a lot of little things that seem odd to be worn on such a new unit with such low mileage. I've attached a picture of the front tire and i'm not all that knowledgeable when it comes to tires but it seems to have more wear and tear then one would think for a unit with only 4,000 miles! Let me know your thoughts!

Thank you!
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Old 05-14-2014, 12:35 AM   #2
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The battery is an easy guess...it has been in storage (tell-tale from the low mileage) and maybe with no external charge. The chassis battery will always have a small parasitic draw from on-board electronics. If left unmanaged, a battery, even if new, will be drained too low to hold a charge.

The tires look to be scalloped...but it is hard to tell from the pics. This could be from improper pressure. A tire shop could probably tell you by looking at the tires.

Congrats on the new to you RV and best luck!
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Old 05-14-2014, 04:29 AM   #3
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Quote:
Originally Posted by Scarab0088 View Post
The tires look to be scalloped...but it is hard to tell from the pics. This could be from improper pressure. A tire shop could probably tell you by looking at the tires.
I would also have the alignment checked, especially if it's only the front tires that look like that. I had a car that the tires did that and it was the alignment, the sad thing is the damage has already been done and even with an alignment you will need new tires. They will keep getting worse and will start to shake and rumble.

I see it looks like it's the rear, so unless they have been rotated it could be just a pressure issue.
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Old 05-14-2014, 05:40 AM   #4
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Have the front end alignment checked. Most likely it has to much toe in or toe out. This will wear the tire out very quickly. Also I believe your air pressure sticker will say 82 psi for front and rear tires. Try 92-95 psi in them. I have found our unit to ride and handle much better at those pressures. Also do the CHF on the sway bars.

Normally the chassis battery is not connected to the on board battery charger/conditioner. So any drain from the engine and transmission controls can drain it over time. Add a battery tender and hookup to the shore power line. This way when you are connected to shore power the chassis battery will also charge.
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Old 05-14-2014, 06:16 AM   #5
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Have the front end alignment checked. Most likely it has to much toe in or toe out. This will wear the tire out very quickly. Also I believe your air pressure sticker will say 82 psi for front and rear tires. Try 92-95 psi in them. I have found our unit to ride and handle much better at those pressures. Also do the CHF on the sway bars.

Normally the chassis battery is not connected to the on board battery charger/conditioner. So any drain from the engine and transmission controls can drain it over time. Add a battery tender and hookup to the shore power line. This way when you are connected to shore power the chassis battery will also charge.
My ACE has a 3 stage charger and it also charges the chassis battery while plugged in, his should to as long as everything is working properly. I leave mine plugged in. 24/7, just top off water in battery's couple times a year.
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Old 05-22-2014, 08:51 PM   #6
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I spoke with Thor and they told me that when connected to shore power the chassis and cabin battery's are charged. Also, I was advised by Thor that in order to prevent the chassis battery from discharging to use the battery disconnect switches when parking the RV. However, I've noticed that when I do so for a few days, the unit struggles a bit to start back up. It almost sounds as if the batteries are dying. The reason i disconnect the batteries is because I can't get things like the Jensen radio to shut off completely. E.g., the blue lights on the radio stay on which i know will eventually drain the battery. Any suggestions? Thanks
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