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Tool Talk Discussion Forum

Battery chargers

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Farmerfred

10-28-2006 23:12:42




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I have several small s6/12 battery chargers that no longer work. Where can I find info on how to repair sthem? Who might have parts?




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Jon Hagen

10-29-2006 11:26:19




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 Re: Battery chargers in reply to Farmerfred, 10-28-2006 23:12:42  
I still have/use battery chargers that had the old selenium plate rectifiers that were so common 30+ years ago.Seemed that setting out in heavy dew or rain was sure to corrode and damage the rectifier units. Being a cheap arse,I used defective rectifier units from Delco 10/12SI alternators where any 1 of the 6 diodes failing makes the unit useless for alternator use,but All you need is 2 good diodes of the same polarity in the unit to work as a battery charger rectifier,plus a good heat sink is built into the rectifier assy. Those diodes are designed to handle 72 amps,so most small battery chargers will never use them anywhere near their limits,so they produce little heat. An added bonus is that the Delco button diodes have less resistance than the old plate rectifiers,so the charger is about 5% "hotter" than it was with the original rectifiers.

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oldfarmtractor

10-29-2006 10:53:00




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 Re: Battery chargers in reply to Farmerfred, 10-28-2006 23:12:42  
Or you can get the diodes from Radio Shack or other online suppliers. I have had more circuite breakers go bad. I open them up, clean the contacts and get right back into business.



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Steve Crum

10-29-2006 19:39:04




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 Re: Battery chargers in reply to oldfarmtractor, 10-29-2006 10:53:00  
Just pray you don't have a fire and the fire marshall doesn't look real hard at your breaker panel. Your insurance company will get a freebee for sure.



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Jon Hagen

10-30-2006 07:06:24




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 Re: Battery chargers in reply to Steve Crum, 10-29-2006 19:39:04  
I think he means he cleans the little auto reset breakers inside the battery charger



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circus

10-29-2006 03:28:31




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 Re: Battery chargers in reply to Farmerfred, 10-28-2006 23:12:42  
Diodes can be found at any alternator repair shop



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Bob

10-29-2006 02:50:31




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 Re: Battery chargers in reply to Farmerfred, 10-28-2006 23:12:42  
In my experience, diodes/rectifiers are what typically fails. The manufacturer of the charger often will supply parts. Have you tried contacting them?



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Tim Casbolt

10-29-2006 02:49:00




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 Re: Battery chargers in reply to Farmerfred, 10-28-2006 23:12:42  
I've had a couple of chargers quit working over the years. Took them apart and found a broken wire inside. Re-soldered the connection, and they're still working today. Exide bought out Schumacher a few years back. One of them should be able to help out if needed.



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Slowpoke

10-30-2006 00:53:00




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 Re: Battery chargers in reply to Tim Casbolt, 10-29-2006 02:49:00  
There are a couple of older books dealing with battery chargers that include schematics. Check with the library or eBay. Sorry, I don't remember the titles.
I have a Schumacher 6/12v charger that no longer works. Last year I called and asked if I could get a schematic. The answer was no, but I could send the unit along with $26 and it (or one like it) would be returned post paid. Adding the cost of my shipping would bring the repair charge to about $36. Local repair shops want $50. It still doesn't work.

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