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Old 05-24-2017, 05:45 PM   #1
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Battery help!

I have a 99 discovery 36T diesel pusher. I have 2 new batteries for the motor that are 860 cranking amps. Can they be normal or do they need to be deep cycle. 2nd question. My 2 6v coach batteries where charged now dead. I just replaced my alternator and the volt meter is on the low normal side. Is that because my 2 6v batteries are dead and my alternator is trying to keep up? My series wire has a ton of green cap on one end so I'm thinking it wasn't keeping charged??? Help me please I'm at the end of my rope.
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Old 05-24-2017, 05:50 PM   #2
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I would immediately clean and put a regular charger one your almost dead batteries. Mine got so low one time that the inverter/charger would not kick in. I got a car type charger and put in on for a day or two at 2 amps and the bats came up and would then be charged by the inverter/charger. I do not think the starting batteries need to be deep cycle - as long and you can keep them up by driving or on a charger. PS I have 4 6v. house batteries that fell real low. I just put the car charger on them as if they were 12 volt batteries and it brought all 4 up at the same time with a day or two at 2 amps. Be sure you keep an eye on water. jmo mark
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Old 05-24-2017, 06:00 PM   #3
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HeislerP454,

Typically, deep cycle batteries are not used for starting battery applications.

On my coach,Freightliner (Alliance Brand) uses two sealed wet cell batteries for starting with about 1100 Cold Cranking Amp (CCA)
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Old 05-24-2017, 09:05 PM   #4
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Ok so I had the 6V batteries tested and they were bad. I ran the rig and the volts were low but above the low red area. I got new 6v batteries and started the generator now all tge batteries are fully charged and my volt meter shows 1/4 above the low line. So if they are all charged will my alternator maintain it now because they were to low in the first place???
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Old 05-24-2017, 09:26 PM   #5
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Engine start batteries are not deep cycle - rather maintenance free type. Typically a pair of group 31 batteries are used in diesel RV applications. Available at Napa, etc.
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Old 05-24-2017, 09:33 PM   #6
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Ok so I had the 6V batteries tested and they were bad. I ran the rig and the volts were low but above the low red area. I got new 6v batteries and started the generator now all tge batteries are fully charged and my volt meter shows 1/4 above the low line. So if they are all charged will my alternator maintain it now because they were to low in the first place???
HeislerP54,
Your "low line" description of battery condition, means nothing to most of us. What you need is a good Volt Ohm Meter. DO NOT RELY on those cheap, Harbor Freight free ones, pure junk. Here's your procedure:

1. Without the engine running, no generator, no shore power, take an ACTUAL volt reading of your chassis batteries and house batteries, note the readings.

2. Start the engine, do all the checks again, note the readings and compare to the first set of readings.

3. Engine off, now plug into shore power. Take all the readings again, note the readings and, compared to the first set of readings.


What all this will tell you is,

1. Whether or not, both sets of batteries are receiving a charge, from the engines alternator
2. Whether or not, both sets of batteries are receiving a charge, from being plugged into shore power, i.e. either a Converter/charger or , an Inverter/Charger.

Once you find out all the data, you now know if you have any problems and, possibly what course of action to take, to correct any potential charging issues.
Scott
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Old 05-24-2017, 10:50 PM   #7
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Thanks Scott. The batteries charge on generator power and shore line. It's when the vehicle is running the volt meter on the dash is borderline low.
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Old 05-25-2017, 10:05 AM   #8
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Thanks Scott. The batteries charge on generator power and shore line. It's when the vehicle is running the volt meter on the dash is borderline low.
You're welcome. We still need to see what ACTUAL voltage you're getting at the batteries, with the engine running. This will tell us exactly what's getting to them and not what the dash gauge says which, may or may not be accurate.
Scott
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Old 05-25-2017, 10:06 AM   #9
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The reading was 11.59 when running and 12.90 off the generator
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Old 05-25-2017, 05:24 PM   #10
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The reading was 11.59 when running and 12.90 off the generator
If these readings are starter battery voltages, neither of those voltages are particularly good. It looks like the alternator isn't charging at all.

If those readings are coach house batteries, looks like the alternator isn't charging them properly. That usually means the big relay that allows both battery banks to charge isn't working, or several other things.

Also, you mentioned green stuff on the battery cables. That indicates to me there could be a bad connection between the cables and the batteries.


Check your Private Messages for one from me.
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Old 05-25-2017, 10:49 PM   #11
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Ok so it's working now. The issue was the the two prong female connector that clips im the male voltage regulator was not mated. It was on the outside of the hole so it wasn't making good contactact. Once I got them inserted correctly I fired up the rig and it went to half way on the gauge witch is 13V. Thanks everyone for there input. Now me and my family can take our trip tomorrow for the holiday weekend. I appreciate everyone on her and your help.
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Old 05-26-2017, 04:40 AM   #12
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Thanks for getting back to us with the fix. Have a great trip!
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