Reply To: Mounting junction box on my aluminum boat

[David Stanton]

Since there is already a negative copper battery cable running to the motor, most or all of the starter current will follow the lower resistance copper cable instead of the aluminum boat, and, as has been said, it may not find a path through the aluminum at all. I have mounted the box directly to aluminum on several boats over the years with no problems. In addition, it is mounting aluminum to aluminum, so no problem with galvanic action caused by unlike metals and moisture.
Dave