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.
When disconnecting a battery, remove the negative terminal (-) cable first, then the positive (+) cable. When connecting the battery, reverse these steps. Attach the positive terminal first, and the grounded or negative terminal last. Be careful attaching cables to terminal posts to avoid creating sparks.