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Battery charger

T

tomturkey

Well-known Member
About 31 years ago for my wife's and my anniversary, we bought our selves a battery charger. We were poor, drove junk and had three under 12. It was a big deal for us, about 150$. A century battery charger with 6volt, 12volt low, 12volt hi and a 6v12v boost. Its worked well until now. At 6volt it shows 6.9 dc volts, good for 6v batteries, but at 12v, hi or low, it only shows its putting out 9.6v dc. Is our anniversary gift now only useable on 6volt batteries or is something some where preventing it from charging at 12.? vdc. The little meter needle has not worked for some time, if that makes any difference. thanks gobble
 
(quoted from post at 13:06:38 05/20/16) About 31 years ago for my wife's and my anniversary, we bought our selves a battery charger. We were poor, drove junk and had three under 12. It was a big deal for us, about 150$. A century battery charger with 6volt, 12volt low, 12volt hi and a 6v12v boost. Its worked well until now. At 6volt it shows 6.9 dc volts, good for 6v batteries, but at 12v, hi or low, it only shows its putting out 9.6v dc. Is our anniversary gift now only useable on 6volt batteries or is something some where preventing it from charging at 12.? vdc. The little meter needle has not worked for some time, if that makes any difference. thanks gobble
Click to expand...
egardless of your measurements, will it still charge a 12v battery?
 
There's a good chance that one of the rectifiers went bad. You could have someone replace it with a solid state rectifier. Ones with the proper voltage and current capabilities are now pretty cheap.
 
I have opened up an repaired a number of old chargers over the years. Depending on what brand it is part may or may not be found for them. I have had timers go bad and both my big chargers have bad timers right now but that is okay they still work just fine just means I have to go out and turn them back off. I have also had the diodes go bad and have replaced a few of those
 
JMOR, I had left my lights on, on my daily driver(91 tempo)battery dead dead. So I put the charger on it. Tried it after a couple hours barely make the solenoid click. That's when I got the meter out, battery only register 10.5 on meter. Then I started doing a little testing. Getting the results previously posted. Maybe it would get there eventually, I don't know. I am very electrically challenged, gobble
 
(quoted from post at 15:35:04 05/20/16) JMOR, I had left my lights on, on my daily driver(91 tempo)battery dead dead. So I put the charger on it. Tried it after a couple hours barely make the solenoid click. That's when I got the meter out, battery only register 10.5 on meter. Then I started doing a little testing. Getting the results previously posted. Maybe it would get there eventually, I don't know. I am very electrically challenged, gobble
Click to expand...
eason for asking was that battery chargers are not filtered and meter readings will vary with type meter used & settings, but if it won't charge a good battery in couple of hours, it is likely broken.
 
tom,
the old school chargers are very simple, transformer with many taps on primary and secondary and a pair of diodes.

Diodes that can handle 100 amp boost or more don't come cheap. Good chance you have a bad diode. Rarely does the transformer go bad, but I've seem bad transformers. And like JMOR said you could have a bad meter.

If Mr Wilson had a problem with his charger, he would want me to fix. He is cheaper than I am.
geo.
 
I googled repair a battery charger and it demonstration how to replace some contacts that go bad, with age. I never did repair mine, but if that is all that is wrong, it is worth looking into.
SDE
 
85 model would have modern diodes and some switches to switch between transformer taps.... The 6/12 volt switch could be bad, or one or both of the diodes... As long as switches are common, they are cheap,, so are the diodes....
 
"You could have someone replace it with a solid state rectifier."

Good LORD are we dealing with a charger so old it has a Tungar "rectifier"?

How many of you are old enough to know what a Tungar tube was?
 
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