Connect black lead to metal point on car chassis.
black lead first coating anticorrosive
The main products are: all kinds of black lead pencil, color lead pencil, craft pen, a special pencil.
When using a multimeter to check voltage,be sure you have a good ground for the black lead of the multimeter.
"The red lead (with the in-line fuse) of the supplied power cord is to be a "hot"(positive) wire, and the black lead to ground."
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