1. Remove the black line of "rescued vehicle";

2. Remove the black line of "rescue vehicle";

3. Remove the red line of "rescue vehicle";

4. Remove the red line of "rescued vehicle".

Note: after the engine is started, it is still important to remove the starting cable in order, or else a short circuit may occur.

Advantages: no circuit part, just two power lines can be completed; Fast startup time, just a few minutes can be done; It's cheap.

Disadvantages: it requires two vehicles to charge the locomotive to the locomotive, occupying the lane, and the operation method is complex and unsafe, especially the high risk factor of taking off the starting line, so it can only be applied to people who are skilled in automobile knowledge.