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.
Start the mower engine. Once the engine is running, disconnect the jumper cables. Begin with the final connection of the negative cable and disconnect in the reverse order of how you connected the cables. Close, lower or reinstall anything you removed to gain access to the mower battery.