When I was living at Penn State Harrisburg Dorms in 1977, I jump started one of those that an other student owned. We did not have jumper cables, so I put the front bumper of my 1976 Volare Coupe touching that vehicles front bumper, and made the + connection by placing his L lug-nut wrench with the lug-nut section against his battery +, and placed the lug-nut section of my L lug-nut wrench against the + of my vehicles battery, then held the two other ends together tightly while wearing winter gloves, and told him to try starting it, and it fired right up. Then told him to drive it to an auto-parts store without shutting it off and have them test the battery.