I made a set of leads with alligator clips that will reach from one end of a vehicle to the other with lead to spare.

To add to what Deve said, after you check continuity in a wire keep one lead clipped to the wire and touch the other to ground. There should be no continuity.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.