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Old 10-14-2012, 04:23 PM   #11
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Originally Posted by carlcaudill
Thank you VinceU
Tried your test and removed the neg lead from the battery and touched it to the post and there were no sparks, tried it with the pos lead and still no sparks. The battery has been charged and will start vehicle.
Couple questions, what's the charging source. Newer unit have chassis and coach parallel charging while travling and on shore power. Do you have meters on these batteries? How old is the coach battery? Any chance the start battery can be leaking through defective circuits back through the coach battery? And lastly how do define "charged"?
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Old 10-14-2012, 04:44 PM   #12
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Plugged into 30amp outlet and charged both batteries. Do not have meters on batteries and the coach battery could be original but when they checked the batteries about 6 weeks ago and told me the chassis battery was bad and replaced it they said the coach battery was ok but I don't know.
The generator and the engine would not turn over because the batteries was run down and after plugging them into the 30amp outlet for a while both the generator and engine would start
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Old 10-14-2012, 07:57 PM   #13
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Originally Posted by carlcaudill
Plugged into 30amp outlet and charged both batteries. Do not have meters on batteries and the coach battery could be original but when they checked the batteries about 6 weeks ago and told me the chassis battery was bad and replaced it they said the coach battery was ok but I don't know.
The generator and the engine would not turn over because the batteries was run down and after plugging them into the 30amp outlet for a while both the generator and engine would start
It's a real possibility the converter is putting out less than needed voltakge. You should pick up a inexpensive voltmeter and using the DC scale measure + and - terminals at about 13.6+ VDC or more. Gotta believe a meter will help. Take readings every couple hours see if things improve. Does not sound like poor connections, wouldn't start at all. Both batteries are involved for engine, chassis bat. And coach bat starts gen. One start each sounds like surface charge, not deep charge you need.
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Old 10-14-2012, 08:05 PM   #14
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Vince has a great point. Deep discharge batteries need HOURS and sometimes DAYS on the charger to replace capacity.

A 100 amp hour battery being charged at the (attached chart of 3 stage charging current) rate at each stage will step down from about 8 amps to less than 400 milliamps at "trickle" which kicks in at 90% capacity.

A fully discharged 100 amp battery on the converter will take 3 days plugged in to replace that 100 amp/hours.
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Old 10-15-2012, 08:49 AM   #15
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After the new chassis battery was installed the RV was plugged in for three weeks, we went on a weekend trip that was about 80 miles away. The RV was plugged in to 30amp service while there and return trip was another 80 miles. Parked RV without connecting any electric and turned off battery disconnect and both batteries was dead after two weeks.
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Old 10-15-2012, 05:52 PM   #16
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Originally Posted by carlcaudill View Post
After the new chassis battery was installed the RV was plugged in for three weeks, we went on a weekend trip that was about 80 miles away. The RV was plugged in to 30amp service while there and return trip was another 80 miles. Parked RV without connecting any electric and turned off battery disconnect and both batteries was dead after two weeks.
When you are plugged into campground power, what is the voltage reading AT THE BATTERY?

When you are plugged into the running truck, what is the voltage reading AT THE BATTERY?

BOTH scenarios require the voltage to be above 12.9 volts Should be at least 13.2 if the converter/alternator is outputting correctly.


Also 2 weeks is about right to completely discharge an OEM battery with just internal parasite draws (about 900 milliamps).
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Old 10-19-2012, 12:07 AM   #17
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My coach batteries will run down in about two weeks with the CD batt d,is connect off. If I shut off the propane detector, the batts will last a little longer.
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Old 10-19-2012, 12:10 AM   #18
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Sent post too soon.... My engine battery doesn't seem to be affected by house drain. Will actually last months. My car sits in storage three months while we are in FL and starts upon our return...

Bill
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Old 10-21-2012, 03:01 PM   #19
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Sent post too soon.... My engine battery doesn't seem to be affected by house drain. Will actually last months. My car sits in storage three months while we are in FL and starts upon our return...

Bill
Yes deep cycle do self discharge quicker, but two weeks is premature. Can always try the spark test removing the neg cable. If big its outside load. If none batt is self consuming and gettig weak. Can always have a load test performed, this will give yoi idea how to proceed.
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