Sent: Sunday, November 06, 2011 10:54 AM Subject: Re: Battery shorting out Hello, You may have just been the lucky one to have two bad batteries. Get the battery replaced under warranty. Depending on where you are getting the battery they may even do a basic test of your charging system. As said, nothing external to the battery should be able to cause one cell to short. Having said that a standard car battery is not a deep cycle battery and repeated deep or full discharges are very hard on the battery and will shorten the life and capacity of the battery. A bad voltage regulator that over charges a battery will cause excessive heat and gas discharge of the battery and damage the battery. You are probably aware but when working on a battery always remove the neg. cable first. It reduces the chances of a wrench slipping and shorting the positive terminal to ground which will cause a major arc that can in some cases result in a battery explosion from the hydrogen gas in the battery. However here are a couple of things that you can check that have been mentioned: Check the voltage at the battery with a good battery in the car and the engine running, you should get around 14 volts plus or minus a little. Check your voltage regulator, take it off (with the neg battery cable off) and look at the bottom. If it has two long wire resistors it is a mechanical regulator and it should be replaced. ALL of the major parts houses have your regulator in stock. Prices will range from $20 to $60 per unit. Ask to see a low to mid priced unit and look at the bottom, no reisistors it should be an electronic unit. Install the new regulator, make sure it is well grounded and all terminals look good. Any new electronic equipment like your sound system will like the new regulator, less electrical noise on the system. Check the terminals on the alternator, (with the neg. battery cable off) all should be in good condition and tight. Again check your voltage at the battery, around 14 volts running and you should be good. Here is a link to some basic information, much more can be done with a Google search: http://www.familycar.com/Classroom/charging.htm Take Care Dennis C. On Nov 6, 5:11 am, Laborboy <labor...@xxxxxxxxxxxxx> wrote:
Any ideas on why a new battery would short out after about a month? Shows a charge, but won't take a load--tester indicates a bad cell. This is the second battery where this happened. How should I diagnose this problem, and what are the potential causes? Engine wiring harness has been replaced, alternator is new. Zack in Chicago 1964 Dodge 330, 318 poly
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