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The positive connector on a lead acid battery is frequently not white. In the United States, the wire that leads to it is usually red. The black wire leads to the negative terminal. The positive terminal on the battery is always indicated by a plus, +, sign. The Negative terminal is indicated by a minus, -, sign. The negative terminal is usually attached to the body of the car. (Cars have a negative ground, except for 1935-1948 Fords.) The positive connector is usually attached to the solenoid and generator. So check the wire that comes from the battery to the solenoid. That is positive. Check to make sure it is connected +.
You don't say what you are connecting to the battery. If you have a black and white wire the best guess would be white to negative terminal and black to positive terminal. If you were connecting a 6V light bulb it really doesn't matter.
The positive leg is usually indicated with a red dot. Sometimes there is an white arrow that looks like a minus sign - that is the negative terminal. If it is a can type, the can is the minus terminal and the tab(s) is(are) the plus terminal(s).
white
Black = Negative Black + White = Positive Tried and tested.
Black is negative, red is positive - if you've got something where your options are color and white, the white is your negative.
The positive wire for the 2005 Toyota Tacoma tail light is red with white stripes. The negative wire is white with black stripes.
The negative space is the white space around the vase. The vase is the positive space.
Generally, white wires are positive. Red is usually negative. However, the construction of the electrical device could be different. It is best to check the instructions.
In a DC circuit Red is positive and Black is negative. In AC systems White is neutral and Ground is green or green-yellow stripe.
The white stripe on clear speaker wire is usually the positive wire. You may also find it with dashes and this is still the one that will carry the positive charge.
Left Front Speaker Positive Wire (+): White/Red Left Front Speaker Negative Wire (-): Brown Right Front Speaker Positive Wire (+): Green Right Front Speaker Negative Wire (-): White/Orange