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On a vehicle the red is positive (+) and the black is negative (-). If they are not color coded the cable connected to the starter is positive and the cable connected to the engine or chassis is negative.
Red is positive. If they are both black then the cable that is connected to ground is negative and the other cable is positive.
On the battery is marked - or +. The red cable is positive and the black is negative.
That is how you connect 2 batteries in parallel. Like terminals are connected together. With this arrangement you still just have 12 volts, but the amperage doubles. You should also see the 2 positive terminals connected together. If not, then you may have a combination of parallel and series.
The battery post positive terminal is where you connect the positive cable. Connect the negative cable to anyplace on the engine or chassis. Connect positive first and remove it last.
The battery cable that is grounded, is connected to the body of the vehicle. Sometimes it is the negative cable & sometimes it is the positive. You need to check which cable is connected to the body of the vehicle.
Then the component will not work or will be unreliable.
its connected to your positive battery cable.
The positive cable is connected to the alternator and starter. The negative cable is connected to the chassis or engine ground. Positive is red and negative is black. The positive post is slightly larger than the negative post.
Red wire is Positive in a car battery. If they are not color coded, find which one is not connected to the chassis and this will be positive.
You have a voltage drop in either the positive or negative battery cable. Clean all of your cable end connections ( at the starter, the engine block and again at the battery terminals). You have a voltage drop in either the positive or negative battery cable. Clean all of your cable end connections ( at the starter, the engine block and again at the battery terminals).
The positive cable goes to the starter. The negative cable bolts to the engine block.