Usually black. Look for a negative sign ( - ) which is a just a hyphen.
ill negitive your chare, positively
Black
BLACK
When installing a new battery in a car, the red color should be connected first.
When boosting a car battery, you should jump start the red color first.
positive is red negitive is black
When charging a car battery, the red positive cable should be connected first.
positive goes to the battery and negitive goes to a ground clamp on the frame..
positive + positive = positive negitive + negitive = positive negitive + positive = negitive
When jumping a car battery, the red positive cable should be connected first.
When jump-starting a car, you should connect the red jumper cable to the positive terminal of the dead battery first.
Positive is normally red.