Always disconnect the negative post first and reconnect it last.
Not both. Disconnect the NEGATIVE post.
You should connect and disconnect the negative post first. This way, if your tool touches ground when you work on the positive post, you don't short circuit the battery.
disconnect the wires starting with the negative post first. there is a clamp holding the battery down at the base of the battery in the middle of the long side. loosen the bolt and tilt the battery out.
disconnect the positive battery post and wait five minutes , then reconnect battery. The light should go out
Disconnect the battery first. First you disconnect the battery. After you disconnect the battery, you can pull it with a pair of needle-nose pliers, but only after you have disconnected the battery. It is quite important to disconnect the battery, or the thing that might be fused to the fusebox might be your hand. So disconnect the battery first.
There are two types of battery cable connections. The clamp type connects to a post on the battery and is held in place by a nut and bolt which squeeze the sides of the clamp tightly around the post. Disconnect by loosening the clamp's nut and then wiggling the clamp off of the post, start with the negative cable (black one). The bolt on type (sometimes referred to as 'side terminal' type) is bolted directly to the battery. To disconnect this type, simply unbolt it and remove the cable end from the battery. Again, start with the negative (black) cable. If the goal is not removal of the battery, but disconnection of power to the vehicle for servicing, disconnection of only the negative (black) cable is sufficient.
Disconnect the negative battery cable.
Best to unplug it and then disconnect it from the battery. Reason being is that if you disconnect it from the battery first you will create a spark. That spark could ignite any fumes from the battery.
You disconnect your negative (-) battery terminal and connect one of the meter's probes to the (-) battery cable and the other terminal to the (-) battery post. Set your multimeter to mA/A and select DC.
Yes, you better disconnect the negative battery cable.
If working on the electrics of a car then it is a sensible precaution to disconnect the battery.
Connect the positive (+) Red cable from the charger to the positive (+) post of the battery. Now connect the negative (-) Black cable to a metal part of the engine. Do not connect to negative battery post. Plug the charger in. Unplug the charger before removing the cables. Disconnect the negative cable first.