Stop in for a cup of coffee

I went on a service call to look at a wiring issue on a pontoon boat at a marina. Owner’s “ mechanic” rewired a customer’s boat. I’m suprised that dipshit can tie his own shoes.
Wired b+ to one side of switch,and b- to other side. Then series off switch terminals to the accessories, lights, horn,livewell pump...

there was fricking smoked wires everywhere. No worries, business owner is an idiot too.
I cant believe people actually brought their stuff there to get fixed.
In my expedience, boats are the worse when it come to wiring. And RV's No one give a crap what the are doing....Always a freakin mess. No matter the cost of the unit.....