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dead battery charger #199756 03/07/11 10:29 AM
Joined: Mar 2011
Posts: 3
B
Bee Offline OP
New Member
Hi-Thanks for having me on. Hoping someone could answer a question on a 6/2 ampcar battery charger that I'm trying to bring back to life.There are three wires from the secondary side of the transformer the two outside (red)wires go to diodes (one for each wire)that are attched to a common bar(heat sink)which is attched to the positive battery clip. The other wire (black) goes to the negative battery clip. My question is, should the two diodes be attached with their cathodes to the bar? Thanks

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Re: dead battery charger [Re: Bee] #199757 03/07/11 10:51 AM
Joined: Aug 2002
Posts: 402
J
jdevlin Offline
Member
What you have is a center tap full wave rectifier. The cathode is the positive and should be connected to the bar.

Last edited by jdevlin; 03/07/11 10:51 AM.
Re: dead battery charger [Re: jdevlin] #199759 03/07/11 11:12 AM
Joined: Mar 2011
Posts: 3
B
Bee Offline OP
New Member
I thought that was right but was alittle confused since there are two wires going to the bar each with a diode.Transformer is also burnt up so can't check voltage on the wires.Thanks for the help.

Re: dead battery charger [Re: Bee] #199761 03/07/11 01:52 PM
Joined: Jun 2004
Posts: 1,273
T
Tesla Offline
Member
If the transformer is burnt -- it's dead.

Stop.

Buy another device.


Tesla
Re: dead battery charger [Re: Bee] #199787 03/08/11 08:58 PM
Joined: Nov 2005
Posts: 823
J
JoeTestingEngr Offline
Member
If the TX is burnt up, is one of your diodes shorted? The TX is the most expensive part but MPJA.com is in Fl. and has some reasonably priced ones. I just tore into an annunciator power supply that was clearing 7A slo-blos on Friday. It was just a full wave center tap, unfiltered supply as you described but with 1N2129A 100V, 60A stud mount rectifiers. One was shorted. The supply seems like overkill for the size of the annunciator.
Joe

Re: dead battery charger [Re: Bee] #199788 03/08/11 09:06 PM
Joined: Jul 2004
Posts: 9,571
G
gfretwell Offline
Member
I would not spend a lot of money trying to fix a primitive
battery charger. You can usually find a fairly nice one in a garage sale for a few bucks. The transformer will usually be the most expensive part in one.


Greg Fretwell
Re: dead battery charger [Re: JoeTestingEngr] #199806 03/09/11 10:15 AM
Joined: Mar 2011
Posts: 3
B
Bee Offline OP
New Member
I replaced the stud mount diodes with bigger 25amp ones that wasn't too exspensive.I know the smart thing to do would be to trash the charger and buy a new one but at the moment I'm semi retired(can't find work ha-ha)and thought I'd try fixing this.If I can find suitable transformer reasonable I'll be ok with that.I'll try the MPJA site.Thanks.


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