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.
Connect the first jumper cable clamp to the positive terminal (+) on the dead battery. Next, connect a clamp to the positive terminal (+) on the live battery. Connect a clamp to the negative terminal (-) of the good battery, and finally attach the last clamp to a ground on the chassis of the dead car.