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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / August 2006Battery will not charge with leads connected
I have an odd problem with a 1994 Grand Am. The battery will not draw any current from a battery charger when the positive & negative cables from the vehicle are connected to the battery. If I disconnect the leads and connect the charger directly to the posts, then it draws current perfectly and charges completely. Any thoughts why the battery will not draw current when the cables are connected? Thanks! > I have an odd problem with a 1994 Grand Am. The battery will not draw > any current from a battery charger when the positive & negative cables [quoted text clipped - 4 lines] > Any thoughts why the battery will not draw current when the cables are > connected? If the battery is in good enough shape to start the car or you're using a manual charger, I have no idea. But in the case of a weak battery and an automatic charger, the car may be causing the voltage to drop below 6-8V, the typical threshhold required for automatic chargers to work because they're designed to not spark when connected to the battery. That usually means there is a black oxide coating either on the posts or the terminals causing a bad connection. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > I have an odd problem with a 1994 Grand Am. The battery will not draw > any current from a battery charger when the positive & negative cables [quoted text clipped - 6 lines] > > Thanks! Mike, That was one of the first thoughts I had, but I wire brushed the cables and posts and the problem persists. The battery is in good shape and the car starts strongly. I'm just stumped. Jason > That usually means there is a black oxide coating either on the posts or > the terminals causing a bad connection. [quoted text clipped - 16 lines] > > > > Thanks! Try a water and baking soda mix - clean the entire battery!!  SignatureBing Bang Boom Viola Done! > Mike, > [quoted text clipped - 26 lines] > > > > > > Thanks! The fact that your charging makes me wonder if your alternator diodes are up to snuff. Test cars throwback voltage, if the alt. is putting out, I'm stumped. No alt. output makes me suspect the diodes. Throwback test tools VOM Connect VOM to Battery should read approx 12 volts Start engine, with engine running, test battery voltage, should be approx 13 or so volts. Same voltage means no output, higher voltage means charging OK Umm, he is not using the alternator.... Mike > The fact that your charging makes me wonder if your alternator diodes > are up to snuff. Test cars throwback voltage, if the alt. is putting [quoted text clipped - 7 lines] > be approx 13 or so volts. Same voltage means no output, higher voltage > means charging OK > Umm, he is not using the alternator.... > > Mike Yea, and 12 volts is essentially a dead battery. And 13v won's really charge one well. Too much guessing and approximation to help. > I have an odd problem with a 1994 Grand Am. The battery will not draw > any current from a battery charger when the positive & negative cables [quoted text clipped - 6 lines] > > Thanks! Dirty battery cables. |
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