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Old 03-15-2019, 10:44 AM   #1 (permalink)
Diesel Boss
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battery chargers

My 25 year old Shumacher is about finished.The new ones are junk!

2007 Classic GMC D/A Ext. cab,s.b.,built 11-2006,Di*Priol boost and pyro gauges,GT3794VA turbo, Edge Insight CTS,Garmin GPS,MBRP catback exhaust,300* hose permanent fix tranny cooling lines,M/A pump rub kit,Prodigy bc,Reese 16,000 lb. slider 4-way tilt hitch.Luverne SS side steps,Truxedo bed cover, Duraflaps all 4 corners, Michelin LTX M/S 2 tires and Bilstein shocks.
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Old 03-17-2019, 12:11 AM   #2 (permalink)
Ron Nielson
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A contrary opinion. The newer chargers, Shumacher or other brand, will do a better job of charging and maintaining your batteries. To some extent, they can desulfate, they can bump voltage up to 16 or 17 volts for short time periods, can handle several battery types, etc.

I purchased a NOCO Genius charger (G1100) and applied it to a battery that had been dead for months and would not charge with my Shumacher. Apparently the Shumacher could not detect bat+ vs bat-, it just wouldn't attempt to do the charge. After running the Genius for a week or two, the voltage was something like 3 volts, I thought something might be wrong with the charger and called Genius customer service. The man there asked me what kind of battery I was working on, and told him it was a GRP31 trolling battery. NO way that charger could possibly charge that huge battery - just won't work - you need to buy a bigger, more powerful charger, said the man. A 1.1 amp charger just won't work. Well, I left the charger on the battery for 3 months. I was out of town and when I came back, the Genius said charger was fully charged. And the Schumacher agreed. And, indeed, it was.

Buy what you like, but don't close your eyes when selecting the charger.

Ron Nielson

2008 2500HD LT CCLB/Ally. Line-X, B&W Companion, MaxLoader Springs, Edge Insight CTS, Kennedy Custom ECM
2009 Arctic Fox 5er, Silver Fox Edition 29-5T, 3.6 Onan LPG, SteadyFast Stabilizers

Last edited by Ron Nielson; 03-17-2019 at 12:12 AM.
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Old 03-18-2019, 09:59 AM   #3 (permalink)
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What is wrong with your Shumacher? The old ones a total of 12 parts in them so not a lot to go wrong and easy to fix most of the time if something did happen.

I think I am running a Century which was the first one I bought maybe 30 years ago. Since then I have had 3 or 4 others and they have not lasted. I did blow the diodes in the Century one time either by yanking the cables off or tripping on the cord. Its only a 15 amp charger but now has a pair of 100 amp diodes in it because that is what I happened to have handy.
98 Burb K25 4.10's 250K miles, new to me, pretty clean and stock.
95 Burb K25 3.73's CRASHED 250K miles, looks to have been rebuilt at least once, stock, bad rust, DE exhaust w/walker muffler, 8' western plow.
81 Buick Riviera GAVE AWAY with the infamous Olds 5.7 diesel possibly still going strong.
15 VW Golf wagon, TDI. Did the buyback on my 13 Jetta TDI wagon so it was basically a trade up.
96 Burb K25 3.42's SOLD at 340K miles, told it was all original, close race between engine wearing out or body completely rust out.
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