What Battery Terminal Should Be Disconnected First. The negative terminal will be marked by a minus sign and black cable and the positive with a plus sign and red cable. WHICH BATTERY TERMINAL TO DISCONNECT FIRST CONNECT FIRST Our Website.
It depends on 2 things and only two things. For safety purposes always disconnect the negative cable first. The negative terminal will be marked by a minus sign and black cable and the positive with a plus sign and red cable.
Disconnecting a car battery is fairly easy but following the proper order is critical for a safe disconnection.
Now plug your charger into the wall or extension cord thats plugged into the wall. Tech B says that a battery load test. Use your wrench to loosen the nut that connects the negative terminal of the battery then remove the nut completely. You can disconnect the positive terminal of a car battery first as long as your tools do not bridge a connection between the positive terminal and any metal surface of the vehicle.
