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Old 05-29-2015, 01:53 PM   #1
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Battery tender

I need to add a Battery Tender to my chassis battery. In searching Amazon I see several models. My coach is plugged in all the time which keeps the house batteries charged, but not the chassis battery. Which one do I need to just maintain basic charge?

Glenn
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Old 05-29-2015, 02:01 PM   #2
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I have used a Battery Minder Plus for 12 years in my motor homes. Also used one for orchard equipment in the winter. They work well.
See BatteryMinder.
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Old 05-29-2015, 02:32 PM   #3
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Just buy a reasonable brand. Not China. Not Harbor Frieght... They degrade and may over charge.

Speaking of that, the OEM charger in our Jayco would charge to 14.7v continuously without any float down. That would boil out batteries also if they weren't watched... So be aware that keeping your coach plugged in may not be a great solution if it doesn't have a smart charger.
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Old 05-29-2015, 03:32 PM   #4
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Glenn, National RV systems are designed to charge both sets (Coach & Chassis) once a prescribed voltage is attained. I suspect your battery interconnect solenoid has failed. When mine failed your symptoms are identical to what I experienced. When traveling, the house batteries wouldn't be charged, when staying, plugged in, the chassis battery wouldn't charge. I used a Battery Tender Junior to maintain the chassis battery until we returned.

Amazon.com: Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger: Automotive

Upon returning I replaced the solenoid with this.

Amazon.com: NEW 12V 150A CONTINUOUS DUTY SOLENOID RELAY FOR GOLF CARTS 300A IN RUSH 1114208: Automotive

This is the exact replacement for the original solenoid, however the rubber pads on the feet wouldn't work without modifications.

DC Power Solenoid - Hvac Controls - Amazon.com

Hope this helps.

Fred
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Old 05-29-2015, 03:38 PM   #5
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Fred, where is the solenoid located? Will give that a try.


Glenn
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Old 05-30-2015, 11:23 AM   #6
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Found it, replacement on order.

Glenn
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Old 05-30-2015, 08:27 PM   #7
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Good luck Glenn, I struggled since the circuit board wouldn't come off the mounts, just took longer and required some "tricks" getting it back in.


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Old 05-31-2015, 11:03 AM   #8
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IF coach is full time plugged in I'd go with the Trick-L-Start.. This hooks up to your isolator solenoid (3-wires one to HOUSE, one to CHASSIS,one to Ground) and provides reverse charging (House charges chassis) same as your Isolator provides normal charging (Engine charges house)

Otherwise Battery Tnder (TM) or Battery Minder (TM) are both brand names and I have used both in the past.
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Old 05-31-2015, 07:18 PM   #9
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Yeah, Fred, I noticed it is really tucked in there. Haven't got it yet, leaving on a short time trip this week, won't have the part till I get back. Then I can struggle with it.

Glenn
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Old 05-31-2015, 07:18 PM   #10
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Second the Trick-L-Start. Used one on my previous coach. Current coach has an Echo Charger so don't need the T-L-S.
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Old 05-31-2015, 09:42 PM   #11
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Thumbs down

+3 on the Trik-l-start....better yet the Amp-l-start.

Ron
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