Isolator working now.. Thank you!!

[It's a beast]

I have a 2007 210 P with the original isolator, which never worked to charge my house batteries while driving. I learned on this forum to first try changing out the circuit breakers... 2 on the isolator and 1 in the back in a metal box behind the battery. I changed the 2 on the isolator itself but still no charge to the house batteries. I needed a new starter, so while my mechanic had it on his lift, I asked him to switch out the breaker in the back, which he did for the cost of the part $10...It worked!!! House batters now charge when I drive! Yahoo!! Thank you to everyone who shares knowledge on this forum. I've learned a lot from you all and appreciate it very much!!