So im recharging my flat car battery and its hooked up to a big car battery charger. Its now been on Slow charge for 4 days. Is there a way to tell if the charger is working? I can hear a definite "humming" from the charging unit. Also when i contact the two clamps I get sparks. There is a Ampere reading gauge on it that is at Zero. The battery was bought new about 18 months ago but never really used. Have it correct Voltage also there is option of 12 and 6. IF I connect a working car battery should it show a change on the ampere meter.
ABSAAR BATTERY CHARGER
20 AMP 6/12 RMS
100 AMP BOOST
NORMAL CHARGE & FAST CHARGE AND START