In an emergency, you can use alligator clips to draw a thicker line. One end is connected to the live wire (like the battery, like the line from the generator to the battery) and the other end is connected to the live wire of the glow plug (the head, a plate of copper wire and the glow plug of each cylinder is connected to it). Just 5-10 seconds.
If you have time, I will be an electrician.