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post #1 of (permalink) Old 02-17-2003, 04:22 PM Thread Starter
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Battery charger repairable ?

While I was charging the battery of my YJ over night the charger got snowed in and gave up the ghost. No lights light up and no juice at the output. I took it apart and it seems fairly simple inside apart of a small circuit board (fully automatic charger) but I'm not an electritian.

Any ideas on how to test for the components? The three switches are the most exposed parts, can they go bad due to water? I was looking for a fuse too but it doesn't seem to have one. Thanks.
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post #2 of (permalink) Old 02-17-2003, 05:20 PM
 
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Re: Battery charger repairable ?

usually the rectifiar bridge goes out on them.

and if it got wet, the transformer COULD be open or shorted also.

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post #3 of (permalink) Old 02-17-2003, 05:47 PM
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Re: Battery charger repairable ?

Car battery charger has to put out something more than 12 volts. A higher voltage has to be present to have current flow to the battery. The more above 12 the faster the battery will charge. So the bridge rectifier will only drop about .7 volts so the step down transformer will kick out something more than 12.7 volts. Now this is something of a simplification but useing hand held meters I'd be looking for something like 15 volts a.c. from the transformer's low side. Check the high side also for 120 v.a.c. line voltage, blown fuse???? If you get the low side a.c. but no d.c. these little bridge rectifiers are cheep. Try Radio shack for a substitute.
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post #4 of (permalink) Old 02-17-2003, 07:13 PM Thread Starter
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Re: Battery charger repairable ?

I looked it again. When I plug it in the transformator now doesn't make any buzzing sound any more and no voltage of any kind output on the low end. So I guess the trans. is fried, right? Better look for a replacement...
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post #5 of (permalink) Old 02-17-2003, 08:35 PM
 
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Re: Battery charger repairable ?

you did check for AC voltage on the low side right? im not sure if a meter set for DC would register AC or not.

check the input side of the transformer, it should have 120V to it ( BE CAREFUL)

if it doesnt have any input voltage look for teh fuse or check the cord, you might get lucky!

oh yeah, check the breaker that charger is plugged into also, maybe it tripped!
try the charger in another outlet!
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