The Truman Doctrine arose from a speech delivered by President Truman before a joint session of Congress on March 12, 1947.
Positive First. When installing a mower battery, always connect the positive cable first. The positive cable is red. It attaches to the battery terminal post marked with a plus sign, the letter P or the word POS. Attach the negative cable last. The negative cable is black.
Attach the red lead from the battery charger to the positive terminal of the battery. Most chargers will have a clamp, like jumper cables, to attach the lead to the terminal. Attach the black lead to the negative terminal of the battery. A second option is to attach the black lead to the frame of the mower.