Positive ground battery disconnect switch?

I got a $30 (2016) Performance Dynamics Auto Inc because they had highest amp rating at time. Note it has an accessory terminal. No more opening and closing the hood, I installed a toggle switch on clock to eliminate off-time battery draw if master switch left on. Not a concourse car at purchase, I made engine compartment safer when swing a wrench around by using vinyl covers on all high amp terminals. Regarding better starting, I have 12 volt neg ground and old timer suggested trick of connecting the battery ground cable directly to the starter motor for better current flow, but be sure there's at least one full sized cable grounding the engine block to the car body.
 

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One small wire activates the solenoid to start the engine. The other (as I remember it) is to provide electrical power to the car's electrical system .... will check that out. Big picture: I was having scary electrical shorts (sparks, smoke) occurring inside my dash board. Some one had wired the heater to the positive side of the ignition switch, unfused and the insulation on the wire had rubbed off. ! Found a couple good articles about how to make these cars safer. So keeping some of the 6 volt wiring, which is over-sized for my 12 volt system, I rewired/rerouted wires and installed modern two-tab fuses (w/panels) for everything. Also, to get high amperage wiring out of the Passenger compartment I installed separate relays for my auxiliary fuel pump, parking and headlights. i.e. now, if the low beams go out I still have high beams and parking lights - do not need to dead-stop and let circuit breaker cool down. Obviously not stock but a heck of a lot safer.
 
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