Quote Originally Posted by Westy's Accessories View Post
You gotta remember change is usually 90-110A, depending on size of alternator. Cranking a diesel can reach 4 times that.
So most electrical stuff like these have a Max burst for X seconds. The red arc isolator is 200A I think, but can handle 500 for 5 seconds (from memory)

The biggest thing is wire size. If you intend On using the second battery as a back up starter the normal 6mm twin core ain't going to cut the mustard. You need to atleast match the size that goes to your starter motor..
I've used 26mm2 welding cable.. Over kill?? sure, but cheap and it's one thing I know will work, and work safely..
There is no way on earth you would have 90-110A running through the dual battery isolator when charging from the alternator.

The override function is just a sales pitch. If you need to use it once that's an error, if you need to use it more often there's something wrong with your setup.

You would be better off investing the money is a good set of jumper leads then battery cables linking your isolator to your second battery.