What battery cable goes on auto battery first?
Safe Way There are really two questions here. First, how to hookup charging/starting cables, and second, how to reconnect a battery to the car wiring if it has been disconnected. These questions are similar, but do not necessarily go together.
Start with hooking up charging/starting cables.
Make sure you have everything in the car turned off ..DO NOT touch the black and red cable together it can explode the battery. DO NOT let the vehicles touch each other. Each vehicle frame is the negative of one of the batteries. It is not the first connection which is the problem; it is the last connection because the final connection WILL SPARK. Charging batteries give off hydrogen gas which can explode, so we want the final connection spark away from the batteries. Connect the red cable from the "dead" positive to the "live" positive. Connect the black cable from "dead" car frame to "live" car frame and use frame contacts well away from the batteries. Remember: last connection to the live car and far away from batteries. To remove the cables, reverse the procedure.
If the question is in reference on how to hook up your car's battery cables to your car's battery after the battery has been been disconnected, for example, to install a new battery, proceed as follows:
Start with everything in the car turned off.
Connect the negative (usually black or bare wire) harness wire to the negative battery post (marked -). Once again, everything in the car should be off so as not to draw a spark when closing the circuit in the next step.
Connect the positive harness wire to the positive battery post (marked +).
This completes the installation.
SUPER IMPORTANT CAUTION! Modern automobiles are filled with electronics. A reversed battery polarity could blow most of this electronics to shreds. If you have any doubts as to battery polarity (where goes plus and where goes minus) STOP and get help. A mistake here could cause thousands of dollars in damages.
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