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.
Connect the positive first and negative last.
No
Typically a ground cable on automobiles is black but don't assume it's correct without checking because someone may have replaced a black cable with a red (or any other color) cable.
Red/positive cable to red/positive cable. Black/negative cable to black/negative cable. The battery is under the cover in front of the air cleaner.
negative
Black is negative and Red is positive.
When connecting jumper cables to a car battery, attach the red cable first before the black cable.
ALWAYS, ALWAYS, ALWAYS connect the (+) cable FIRST. The reason it sparked was the ( - ) negative cable was already connected.
The black one is the negative.
Normally the black battery cable is negative.
The red cable is the positive and the black cable is the negative. The positive post is slightly larger.
Connect them in series. With the 2 batteries sitting side by side just connect the negative terminal (-) on battery # 1 to the positive terminal (+) of battery # 2. Now connect the red hot cable to the positive terminal of battery # 1. Then connect the negative black cable to battery #2. You will have 12 volts but the amperage of only 1 battery.