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.
Open the hoods, find the batteries, and get out the jumper cables. Connect the red clamps to both batteries' positive terminals. Connect one black clamp to the good battery's negative terminal, and the other clamp to some grounded metal on the dead car. Start the working car, then the dead car.