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Old 01-01-2011, 02:53 PM   #15
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My chassis batteries are non maintence i guess since threr are not caps to put water. how about them for the winter. Rivrduk
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Old 01-01-2011, 09:07 PM   #16
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Watch out for "batteries suddenly going toes up" in that some MH mfgrs improperly bridge battery banks together to share charging, and under NO circumstance is that allowed, or safe. the banks can exchange high currents and damage each other
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Old 01-01-2011, 09:10 PM   #17
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Quote:
Originally Posted by rivrduk View Post
My chassis batteries are non maintence i guess since threr are not caps to put water. how about them for the winter. Rivrduk
The current scam in "maintenance free batteries" is to HIDE the fill caps under a label. Federated did/does that with a label that said no warranty if the label was removed, and to properly maintain, the label must be removed.

The only batteries that are really maintenance free are completely sealed and use recombination to reclaim the water. The ordinary off the shelf car battery is not maintenance free. Look for a vent....

Its profitable to hide the caps and let the battery die a premature death from drying out.

Just after the warranty runs out...
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Old 01-02-2011, 08:19 AM   #18
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Battery load tester should be less that $50. Shop around and online.
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Old 01-02-2011, 03:14 PM   #19
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Some coaches (Mine) the house converter charges EVERYTHING (Chassis and house) others... Not so.

Page 2: Run the generator 1/2 hour under at least 1/2 load, not 1/4 as you are doing.
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Old 01-02-2011, 03:22 PM   #20
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Hi Pete & Linda,
The price of a load tester may depend on the load the tester applies to the battery. Do you find testers rated for 130 AMPs for 15 seconds available for $50?
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Old 01-02-2011, 10:08 PM   #21
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How can i know this on my MH which is a national tradewinds model 7373, year 2000. Rivrduk
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Old 01-03-2011, 08:37 AM   #22
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Hi rivrduk,
To make a quick but informal test:
1. Connect the coach to shore power.
2. Take a DC voltage reading across the chassis battery(s).
3. Take a DC voltage reading across the house batteries.
4. Are they the same VDC reading? (I mean exactly the same to the first decimal point.)
5. If yes, the coach charges both sets of batteries when connected to shore power.
6. If no, the coach may not charge the chassis batteries when connected to shore power.

I mention this is an informal test. There are times when the VDC reading may not be the same, but the coach still has the capability to charge the chassis batteries when connected to shore power. An example is when there is a bad chassis battery. The coach charger may not be able to handle a bad chassis battery or the battery will no longer accept the charge.

The definite answer as to the coach's capability is to determine what National used on your coach to have the charger charge chassis and coach batteries. There are several ways this can be accomplished. I do not know National coaches.

Look at post #3 in this thread. Gary feels your coach has this capability.
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Old 01-03-2011, 09:20 AM   #23
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Or you can simply put volt meter on chassis battery, take reading which should be 12.something and then plug coach in to see if reading goes over 13 which would indicate charging.
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Old 01-03-2011, 09:49 AM   #24
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GaryKD, yes check amazon.com
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Old 01-03-2011, 12:22 PM   #25
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Hi Pete & Linda,
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Old 01-05-2011, 08:56 AM   #26
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The house batteries showed 14.4 plugged in and 13.4 unplugged. The chassis batteries showed 12.1 plugged in and 12.1 unplugged. Rivrduk
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Old 01-05-2011, 10:47 AM   #27
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Those readings tell me the:
1. chassis batteries are not being charged by your coach when connected to shore power
or
2. One or both chassis batteries are bad.

Now the choice is up to you.
1. Get the chassis batteries fully charged and load tested.
2. Determine if YOUR coach is set up to do this. I do not know your brand and how it may be set up to charge the chassis batteries.
or
3. After charging and load testing the chassis batteries and they test good, purchasing a Battery Minder may be the simple and cheapest solution.
4. One could also put a small solar panel on the roof for maintaining the chassis batteries. I do not know the cost of this solution.
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