I have the same problem, the Balmar Regulator
keeps blowing the 10A fuse. Apparently the fused wire powers the box and only needs a fraction of an amp. I had the alternator
re-wired to the regulator. Nothing wrong with the previous wiring
was found, and the problem persists. It seems to occur when the bow thruster is used and I noted that the Cristec's dedicated alternator
sense connection is in fact connected to the engine battery
. However this shouldn't explain why the Regulator demands more than 10A.