Jumper wire

In "run" you should see (it varies) somewhere around 6-8 or 10V at the coil, with the engine stopped. If you see full battery, the coil/ ign box are not drawing current.

In "start" you should see "same as battery" at the coil +. If the starter grinds the battery down to 11V, then about 11 is what you should see at the coil +. IN NO CASE should the coil + be reading LESS than about 10.5 when cranking