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Bad contact on battery use multymeter to check if voltage is there if not open the battery pack and see if bad connection exists or try another battery
If your battery is totally flat some chargers see this as connecting to a short and will not charge. If the battery has a charge run it down some, my batteries often don't take much of a charge if any. Does the charger light up.Does the charger have any fuses on its out put wiring. Open the charger up, do you see fuses. When the charger is on do you see any blinking lights. If you get a blinking yellow light when hooked to a battery there is something wrong with the battery. Hope this helps
If all lights go out after the battery is inserted, the charger has entered pre-charge mode. In approximately 5-10 minutes, the orange and red lights should turn on indicating that fast charge has been initiated. If all lights remain off after 15 minutes, remove the battery. The orange light should glow. Reinsert the battery. If the orange light goes out when the battery is inserted and all lights remain off for 15 minutes the battery should be replaced.
If both lights are on and both are flashing the charger is reading the battery as defective and the charger won't charge the battery. If the Red light (yellow if plastic is faded) is on and the green is flashing the charger is trying to charge the battery. If the battery won't charge replace it.
I had the same problem and found a solution on another forum...
Plug the battery into the charger. The yellow and green lights come on. Leave the battery plugged into the charger. Plug and unplug the charger power cord from it's power source a few times until the the red charger light comes on..... problem solved!
I think the "smart" circuit in the charger that is supposed to trickle charge before the regular charge cycle needs at least some battery power to test and start the cycle. If the battery is totally discharged, the test can't deternine the battery status and will not charge.... Plugging and unplugging the charger seems to bypass this teat and charge the battery normally. The charging process should work normally after this method.
I hooked a 12 volt car battery charger to the battery for about two min. Then I put it in it's own charger,the yellow & green lights came on for about 5 sec. then the red light came on . About 30 min. later the green light came on and the battery is fine.
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