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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
Best Answer: Hi there the only way you can check them to see if they are working,without taking them out is to disconnect them individually from the bar or wiring to plug then run a wire from the positive side of the battery to the plug connection, if the plug is working you will see a spark when you touch the wire.