I know according to the below FAQ that a magus may cast a touch spell with multiple charges and deliver them all through a weapon attack. This uses spellstrike.
My question is on all rounds after the first in which he casts the spell does the magus receive his touch attack from the touch spell as an extra attack via spell combat or is he limited to his normal amount of attacks granted by his BaB but with each carrying a charge of the touch spell?
You only get a free attack on the round you cast it, just like any other spellcaster getting a free touch on the round they cast a touch spell.
After that, you have to use your regular actions/attacks to deliver the touches.