there is no normal way... there are many ways. you'll have to look and follow every wire and see how yours is wired. and determine if it is ok or not.
I've seen thurster banks directly connected to a house battery. (so one large bank with a 30' long jumper wire. and of course this wire never gets fused at all let alone on both ends. so it's super unsafe. and likely can't be fused big enough for the wire to not blow.
you can do it with acrs. but you'll going to see huge current
. you'll still see 50% + of the thruster current
through the acr wire. so you still need 2/0 or 4/0 wire with the acr. and fuse both sides high enought that it won't blow. at which point you may as well just scrap the thruster battery. the only way this works well is if you are able to shut the acr off while the thruster is engaged. to stop the high acr current while thrusting, but engauge it after for charging. you can use the acr SI port and figure out how to tap off the thruster controls to engage it. (both left and right, so you'll need diodes etc)
I've seen thruster banks with only an AC charger
so it will only charge from a gen or shore power
, never from an engine. this is not ideal. unless you are running the gen a lot.
the easier way is with a echocharger as the max current is always known and you can run small wire and fuses
. the battery will drain while using thruster, and take a little while to charge back up. but it's not an issue unless you are using the thruster non stop.