Hi Rusnut, I can’t see an easy way for my gear to do what you want.
My SC80 in it’s standard form is 12v for the primary circuit ( through the main relay ) and the secondary circuit ( the second relay ) can have any voltage from 0v the 30v wire through it so it could be used to control a 24v circuit but all voltage referencing will be via the primary ( 12v ) circuit.
The SC80 is also available in a 24v version ( special order, no extra cost ) and works the same only now all voltage referencing will be via the primary ( 24v ) circuit.
What I would suggest is to contact a supplier of Trolling motors as there are a number of multi voltage controllers for these, 12v, 24v and 36v.
They may have something that meets your needs.
Cheers, tim.

