OK. It's not a photo, but here's a graphic of the wiring upgrade I'm considering.
Battery switch wiring plans draft - no name.jpg
I've added a radar arch from Atlantic towers... but still need to wire up my spreader lights, antennas, etc. I'm also relocating the battery, adding a 2nd battery, and rewiring *everything* in the boat.... more to come on that, with pictures

... I *promise*
I want to relocate the battery from the stern to under the passenger seat, and also add a second battery, and an automatic charging relay.
I'm still trying to figure out if extra wire will allow the motor to start OK (suzuki DF140 2 stroke), or if I'm asking for problems. I plan to add 27' to each the positive and the negative leads of the starter circuit.
I'd like to use 4 AWG tinned copper if that will work, but might have to go with 2 AWG -- although I really don't know if either will work or cause problems.
Any advice would be helpful.
Thanks!
-Phil