How To Hook Up Jumper Cables To A Lawn Mower. Attach the negative/black clamp on the jumper cable to the car battery's negative terminal. Connect the remaining negative/black clamp to a metal portion of the lawnmower's frame.
Connect the red cable to the positive terminal on the lawn mower battery. Connect the cables in this order. The other end can then be attached to any metal part of the lawn.
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The clamp needs to be connected firmly. Connect the red cable to the positive terminal on the lawn mower battery. On the good car battery, attach the other ends. Connect one end of the earth (black) cable from the jumper to the negative terminal of the battery.