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Old 06-13-2017, 07:50 AM   #11
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like eastcoast said, 2 group 31, wired in parallel (12v).

battery 3 and 4 could be for wheel chair lift, or any number of school bus accessories.

no deep cycle for starting batteries. 2 commercial group 31. 1 battery will be a bit over 1000 CCA.

if you had deep cycle in there, that was definitely a service battery for an accessory.
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Old 06-13-2017, 12:30 PM   #12
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Chassis: Blue Bird TC RE 3904, Flat Nose, 40', 277" wh base
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So, now, how many CCAs do I need to turn this 8.2 over,
After sitting for 10 yrs, I would say about 1.21 Jiggawatts.

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I'll bet one g31 would start it just fine.
Two would surely do the job.
IDK why anyone would need 4.
What were batteries like back in 1980? My '72 Duster with a slant 6 didn't need anything special but if batteries were only 300~400CCA, I could see 4. Maybe it was a cold weather bus as well?

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like eastcoast said, 2 group 31, wired in parallel (12v).

no deep cycle for starting batteries. 2 commercial group 31. 1 battery will be a bit over 1000 CCA.
One 8D battery is 1400 CCA. Mine has 2 with no ramps, etc.
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Old 06-13-2017, 03:51 PM   #13
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I'll bet one g31 would start it just fine.
Two would surely do the job.
IDK why anyone would need 4.
I have the 8.2 in a ford chassis, Thomas body.
I have two group 31 batteries wired in parallel to provide the cold cranking amps but I have started the bus on with one battery. But that was in the spring,summer in NC and after sitting for a few weeks.
I would recommend dropping and cleaning the fuel tank or just to get it started run a new fuel line from the filter suction to a fuel can sitting on the ground.
But before even attempting a new fuel filter and clean fresh fuel are a must.
I have the wiring diagrams for Thomas body that have some GM wiring on them.
I suck at posting pics on here so I can text them to you if you want them to help with the switch.
252-503-8801 let me know.
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Old 06-13-2017, 03:58 PM   #14
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Admin. Might holler cause I posted a phone number so PM me and we can do it all secretly if they don't like it.
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Old 06-14-2017, 08:00 AM   #15
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Admin. Might holler cause I posted a phone number so PM me and we can do it all secretly if they don't like it.
If an admin bitches about that, they need slapped up side the head. It's your number. As long as you don't care about some knucklehead sending it to Amway and the Christian Science folk then who else would care?
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Old 06-14-2017, 09:43 AM   #16
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Thanks, everyone. I got impatient yesterday, while I was away from the internet and put one battery @ 650 CCA in the beast.
My plan was to bump the engine over, just to see how it would fair and had my jump box at the ready.
I couldn't bump it quickly enough. I don't think it made one revolution before it was idling without even a puff of smoke to speak of.
I immediately shut it down in disbelief of what had happened. Once I came out of shock and stopped uttering slight profanities under my breath, I turned to my dad who was speechless. Did a quick walk around and then fired it back up and let it idle for 2-3 minutes. Gauges all looked good normal so we drove it a couple hundred feet. I'm still somewhat disillusioned but very happy so far.

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Old 06-14-2017, 09:52 AM   #17
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Rated Cap: 84 pax or 1 RV; 33,000lbs
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Originally Posted by xciter101 View Post
Thanks, everyone. I got impatient yesterday, while I was away from the internet and put one battery @ 650 CCA in the beast.
My plan was to bump the engine over, just to see how it would fair and had my jump box at the ready.
I couldn't bump it quickly enough. I don't think it made one revolution before it was idling without even a puff of smoke to speak of.
I immediately shut it down in disbelief of what had happened. Once I came out of shock and stopped uttering slight profanities under my breath, I turned to my dad who was speechless. Did a quick walk around and then fired it back up and let it idle for 2-3 minutes. Gauges all looked good normal so we drove it a couple hundred feet. I'm still somewhat disillusioned but very happy so far.
Congrats!! I dunno if I would have done that without a complete fluids change tho. I guess diesels are forgiving but I wouldn't want funky tranny fluid or oil going thru it.
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Old 06-14-2017, 10:14 AM   #18
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Ah, the joys of firing off an old, all mechanical diesel engine! I fired off my 9L IH on just one group 31 battery (and the post wasn't even screwed tight, just sort of laying there). Check the oil and coolant, change both would be a good idea. Drive out the old fuel (Yeah, yeah, I know some folks are recommending draining it), but do change the fuel filters. There's probably at least 2, possibly 3. Drain the water separator if it has one (and it very well should). Check the air in the tires, they should be at least 85 PSI. How's the brakes feel? (You may have answered this, it's early for me and I'm feeling too lazy to read through.) If all is well up to this point, and you have tag/insurance, I'd ease out on the road and see how it feels.
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Old 06-14-2017, 10:17 AM   #19
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it runs!!!!! go take a School Bus ride!! and get the biggest grin on your face you have ever had! trust me you will!!

congrats!
-Christopher
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Old 06-14-2017, 10:23 AM   #20
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Quote:
Originally Posted by Brad_SwiftFur View Post
Ah, the joys of firing off an old, all mechanical diesel engine! I fired off my 9L IH on just one group 31 battery (and the post wasn't even screwed tight, just sort of laying there). Check the oil and coolant, change both would be a good idea. Drive out the old fuel (Yeah, yeah, I know some folks are recommending draining it), but do change the fuel filters. There's probably at least 2, possibly 3. Drain the water separator if it has one (and it very well should). Check the air in the tires, they should be at least 85 PSI. How's the brakes feel? (You may have answered this, it's early for me and I'm feeling too lazy to read through.) If all is well up to this point, and you have tag/insurance, I'd ease out on the road and see how it feels.
I absolutely understand being cautious with the fluid changing but I've done old gas vehicles so many times that I couldn't wait. And typically I had a harder time than this. I'm actually going to pick up an RV today and start that battle with its 454 BB Chevy that's been sitting about 10 years also.
The brakes feel great and the tires look good too. All of them were still fully aired up. I am eager to take it around the block one time.

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