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.
Securely attach one of the jumper cable's positive cable clamps [red] to the good battery's positive terminal [marked with a plus symbol [+] or the letters POS [for positive] embossed in raised letters next to the positive terminal. The negative terminal will be identified with a minus [-] symbol next to it.     3. Securely attach the other end of the positive cable to the positive terminal [+] of the dead battery.     4. Securely attach one of the negative jumper cable clamps [black] to the negative terminal [-] of the good battery.