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.
Step 2. Loosen the battery cables with a wrench and pull them off the battery terminals. Remove the cable from the positive terminal first. You can leave the battery in the mower while charging it, but if you may prefer to take it out, you can do that, too.