[gmc1941]

With everything disconnected as jdl said, you should have no spark. The other thing you can do if you have a multivolt meter put in series with the cable you disconnected. That means remove the cable and attach the meter to the and to the terminal you remove it from. set the meter for amps. you should read Zero. I you read anything you have short or draw on the battery. If don't have a meter find the smallest fuse less the an amp and put in series and see if it pops. Don't rely on the spark that your getting from the battery. A 6volt battery that is down to 3 or 4 volts will spark. Good Luck