a+ and a- are one coil, but it should be on 1A and 1B on the ramps.
The number in 1a or 2a is the coil identifier, the letter is either end of the coil.
So 1A and 1B is one coil
and 2A and 2B is the other coil
The number in 1a or 2a is the coil identifier, the letter is either end of the coil.
So 1A and 1B is one coil
and 2A and 2B is the other coil