How many amps does my starter motor pull ?

[dabbler]

MY12. D4D.

How many amps does the starter pull from the cranking battery ?

I have 2x140ah in the tub connected by 6b&s to the cranking batt. Everything connected to the aux batteries can be isolated from the cable run both before and after a 60amp fuse (also in the tub).

Can I use my aux batteries to help starting in an emergency or is the 6b&s just going to go up in flames ?