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Length and wire gauge will determine this for you...
there is no ground in a car electrical system.
The voltage does not depend on the gauge of the wire, but on the thickness and type of insulation.
Yes, NEC has an entire chart on grounding.
You need a 3 conductor wire with ground. For example if you had a 30 amp breaker for that outlet you would need 10awg 3w/ground. That's 10 gauge 3 conductor with ground and replace the old wire back to the panel.
Length and wire gauge will determine this for you...
That particular wire is usually 10 gauge.
It is the ground wire for the fuel pump. The Red wire is the power wire for the pump. the dark blue is the signal wire for the gauge and the black is the ground for the gauge.
Not always. You could have a conduit with 10 pairs of 14 gauge wire - not every wire in that bundle are going to be ground. Ground is usually identified as having a green coating on the wire ... sometimes it is just bare copper strands or a solid copper wire.
You will have to be much more specific to get an answer. Your description fits many items. -Wire gauge and metal at least is needed.
the gauge of the wire determines how much amperage a wire can carry the insulation determines how much voltage the wire can handle
there is no ground in a car electrical system.
The voltage does not depend on the gauge of the wire, but on the thickness and type of insulation.
follow the instructions, if you have no instructions then ussualy one wire to negative side of coil and the other wire goes to ground.
check your ground wire to the gauge
Ground the power wire and have someone watch the gauge. If it goes to full then the gauge is working. Clean the ground connection and turn the key on and if it reads then it is okay. If not then you have a bad sending unit.
Yes, NEC has an entire chart on grounding.