As part of upgrading the battery wiring in my Catalina 310 I increased the battery charger wire size to #2. I first connected it to a 30A Promariner Pronautic charger and discovered that a #2 heavy duty lug would not fit on the charger positive stud-it ran into the power transistors on the circuit board just above the stud. So I had to grind about 1/4" off the top of the lug to make it fit.
Yesterday I upgraded the charger to a Sterling 50A model (bigger batteries, bigger charger to keep them happy). This time the negative lug wouldn't fit-there was a diode mounted vertically that blocked the lug (on the 30A charger the diode was flush mounted on the circuit board and out of the way). So that one got ground off also.
I didn't have any #2 starter lugs, so I don't know if they would have fit fine, but I was quite surprised that neither charger was able to accomodate the heavy duty lugs without modification. Here's a picture of the 50A Sterling charger showing the fit after grinding. I should add that these are not FTZ lugs, they are NSPA, but I can't imagine that the length of the lug past the hole would be that different between them.
I also discovered that there's no possible way for the plastic cable holder to fit over a #2 cable with heavy duty lug, so I just left that off.
Yesterday I upgraded the charger to a Sterling 50A model (bigger batteries, bigger charger to keep them happy). This time the negative lug wouldn't fit-there was a diode mounted vertically that blocked the lug (on the 30A charger the diode was flush mounted on the circuit board and out of the way). So that one got ground off also.
I didn't have any #2 starter lugs, so I don't know if they would have fit fine, but I was quite surprised that neither charger was able to accomodate the heavy duty lugs without modification. Here's a picture of the 50A Sterling charger showing the fit after grinding. I should add that these are not FTZ lugs, they are NSPA, but I can't imagine that the length of the lug past the hole would be that different between them.
I also discovered that there's no possible way for the plastic cable holder to fit over a #2 cable with heavy duty lug, so I just left that off.