Always disconnect the negative cable first and reconnect the negative cable last. Do this and you won't get into trouble.
Just disconnect the negative cable from the battery.
Just disconnect the negative battery cable then install the speakers.
Disconnect cablesremove hold down bracketLift out battery
Disconnect the Battery.
Disconnect battery
disconnect negative battery cable
Remove battery cables - both batteries
Disconnect the battery for 15imutes
Never disconnect a battery while an engine is running!
try to disconnect battery for 30 seconds
disconnect the battery for about 5 minutes, that should do it
Disconnect the negative terminal first. Then disconnect the positive terminal. Pull the ends straight up. Unbolt the top of the battery frame and lift up the cover on the battery.