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.
If you connect the negative first you have made a connection from  the battery to the whole body of the vehicle. When you then connect  the positive using a spanner (wrench)â¦ and whilst(while) touching  the positive terminal connect with the body of the vehicle with the  other end you will cause a short circuit.