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Old 03-10-2019, 03:44 PM   #21
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The bus sat for only a couple weeks. I recently replaced one of the three batteries and the bus started right up. Just yesterday they read 8 volts with a multimeter. I have good advice here and will pull the batteries and determine if they can recover. Unfortunately I can’t run a trickle charger where I store it. No electricity. I need to actually figure out what’s going on. It’s all good. This is exactly what I need to learn so I can be competent down the road.

Joe
Figure out your issue first and then get a battery disconnect switch, shut your batteries off when stored for any period.
https://www.amazon.com/Zoostliss-Bat...omotive&sr=1-5
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Old 03-10-2019, 04:29 PM   #22
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Figure out your issue first and then get a battery disconnect switch, shut your batteries off when stored for any period.
https://www.amazon.com/Zoostliss-Bat...omotive&sr=1-5
Yup. Iíll do that.

Joe
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Old 03-10-2019, 06:16 PM   #23
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Our E-450 with a 7.3L Powerstroke sits all winter so I put a charger on the starting (2 31D batteries) and house banks about once a month. Voltage on both banks will start off at 12.7 volts after a good charge and after 4 weeks will drain down to 12.3 volts or so which is 60% charge.

Even new, uninstalled batteries will slowly self discharge over time, but shouldn't drain any where near as fast as yours are. Most auto parts stores will load test your bats for free (in hopes that you'll buy your new ones from them). As others have said, replace them at the same time and look for recent and similar build dates.

To test for parasitic draw, disconnect the negative cable and wire a 12 volt light bulb between the cable and the post. If there's a draw the light will glow. Then you can pull fuses one at a time until the light goes out. That, at least, will show you where to look for the problem.
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Old 03-10-2019, 08:49 PM   #24
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I love to muddy the waters! When the battery is disconnected in many late model vehicles with computerized engines, transmissions and ABS braking systems they loose their "learned" settings and operate very badly until all the units communicate with each other and "re-learn" what the driver expects of them. According to the operators manual for each of my computer controlled vehicles (last year of production Crown Vic, my newer Tahoe and my '05 Isuzu drive line in my skoolie) there are specific procedures to follow after each battery connection interrupt to get the re-training accomplished. My bus is particularly upset with a battery disconnect and hardly runs until things are reset.

I've had good luck with various solar powered chargers on a fleet of CV training vehicles which were used for a week or so every 6 months with out having to do anything else. Fortunately, My vehicles are all parked where shore power is available so when I park I just plug in.
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Old 03-10-2019, 09:29 PM   #25
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I love to muddy the waters! When the battery is disconnected in many late model vehicles with computerized engines, transmissions and ABS braking systems they loose their "learned" settings and operate very badly until all the units communicate with each other and "re-learn" what the driver expects of them.

I was afraid of that happening on our bus but several long term battery disconnects later we've had no re-learn issues. Maybe the technology is just old enough to avoid that hassle. After swapping out the battery, my 2001 GMC van would idle really slow or stall for a while when I let it idle. After I drove it for an afternoon it would be fine but what a pain, especially sine I didn't know what was going on at the time.
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Old 03-11-2019, 12:01 AM   #26
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When I worked at O'Reilly's we had a battery box that plugged into the diagnostic port when changing batteries. It mostly only saved your preset radio stations and nothing more.
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Old 03-11-2019, 06:49 AM   #27
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Is this type ok?

Joe

https://www.amazon.com/Post-Battery-...gateway&sr=8-3
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Old 03-11-2019, 09:21 AM   #28
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Quote:
Originally Posted by TeacherJoe View Post



That won't handle the size cables that buses have, better suited for autos or smaller boats etc. I use that on my Suburban battery but you need a heavier duty disconnect for your bus.



I was thinking of mentioning the issue that Mt Trunt brought up about disconnecting batteries and loosing memory of certain functions.

On second thought I decided not too because this would be a good opportunity to see what happens with your individual bus. Hopefully it won`t bother it but it may for a few miles and starts until it learns again how you drive it.
There are maintainers for this that eliminate any disconnect issues but I didn`t want to complicate your battery problem and correction so neglected to mention that point. keep it in mind for future though.


John
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Old 03-11-2019, 10:44 AM   #29
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To keep this automatic (I am forgetful) I use this BlueSea "low voltage disconnect' device on all my vehicles that need to sit.


: https://www.amazon.com/dp/B00GZOP53M..._XiOHCbT4M77JR



Basically I leave the battery directly connected to the starter solenoid and starting heaters.


Everything else passes passes through the LVD.
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Old 03-11-2019, 12:21 PM   #30
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That won't handle the size cables that buses have, better suited for autos or smaller boats etc. I use that on my Suburban battery but you need a heavier duty disconnect for your bus.



I was thinking of mentioning the issue that Mt Trunt brought up about disconnecting batteries and loosing memory of certain functions.

On second thought I decided not too because this would be a good opportunity to see what happens with your individual bus. Hopefully it won`t bother it but it may for a few miles and starts until it learns again how you drive it.
There are maintainers for this that eliminate any disconnect issues but I didn`t want to complicate your battery problem and correction so neglected to mention that point. keep it in mind for future though.


John
Those units are rated at 400a and the bolt hole for the cable is the same as autos. Why wouldn't it handle use in a bus when specifically made for RV's? As many post as there have been fro members changing batteries, I've never heard a story of lost memory.

I do like that dash mounted switch on the one Pete posted. A bit more money, but the dash switch is a bonus.
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