If you first connect the negative cable then when you connect the positive cable there is a chance the wrench will complete a circuit.
Positive and negative car battery cables.
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I am assuming you are referring to installing a battery not performing a jump start.
It is only a safety issue.
Remove the positive jumper cable from the vehicle that needed a jumpstart.
There are also positive and negative cables in the jumper cable set.
The plus is the positive cable terminal the is the negative.
One is marked positive the other negative.
Then remove the positive cable from the car with the good battery don t touch a grounded part of either car with the clamp of the positive cable.
The red one is positive the black one is negative.
First remove the negative cable from the car you jumped then the negative cable from the car with the good battery.
Each battery has two metal terminals.
Disconnect the cables in the reverse order.
Find the red positive and black negative battery terminals.
Allow the engine to run for approximately 30 minutes so that the alternator can charge the battery.
The positive jumper cable should attach both batteries positive poles while the negative jumper cable attaches the two negative battery poles.
Sometimes you can attach the negative cable to the negative pole of the donor battery and instead of attaching the other end to the negative pole of the discharged battery clamp it to a metal piece.
Positive and negative battery cable are made for a specific connection between a vehicle and the car battery.
The battery will have labels marked with a and a sign.
Negative cables bolt directly to the body of the car or engine block positive cables attach to the starter.
Second always remove the battery s ground clamp before loosening the positive.
Remove the negative and positive jumper cables from the vehicle with the known good battery.
If you remove the negative clamp and inadvertently complete a circuit to ground there will be no current flow.