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#199756 - 03/07/11 11:29 AM dead battery charger  
Bee  Offline
New Member
Joined: Mar 2011
Posts: 3
florida
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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#199757 - 03/07/11 11:51 AM Re: dead battery charger [Re: Bee]  
jdevlin  Offline
Member
Joined: Aug 2002
Posts: 402
welland ontario canada
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 11:51 AM.

#199759 - 03/07/11 12:12 PM Re: dead battery charger [Re: jdevlin]  
Bee  Offline
New Member
Joined: Mar 2011
Posts: 3
florida
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.


#199761 - 03/07/11 02:52 PM Re: dead battery charger [Re: Bee]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
If the transformer is burnt -- it's dead.

Stop.

Buy another device.


Tesla

#199787 - 03/08/11 09:58 PM Re: dead battery charger [Re: Bee]  
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 790
Chicago, Il.
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


#199788 - 03/08/11 10:06 PM Re: dead battery charger [Re: Bee]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,123
Estero,Fl,usa
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

#199806 - 03/09/11 11:15 AM Re: dead battery charger [Re: JoeTestingEngr]  
Bee  Offline
New Member
Joined: Mar 2011
Posts: 3
florida
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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