Circuit resistance test

[GN]

I want to do a circuit resistance test on my car. The questions I have are,1) when I disconnect the coil wire and ground it, what gauge wire should be used? 2)Can I ground it to the engine block or the body?3) What is a heavy jumper wire gauge for a solenoid test? 4) Will alligater clips work for all of these? 5) Who can do a starter current draw test? 6) Can one be rented?

[captnsim]

1 8-10
2 both take your pick
3 8
4 yes
5 anyone with a amp clamp and/or a multimeter test voltage with key off...then under cranking difference is draw
6 Not sure....