Just wanted to chime in on how I made this work for me. 07 Nissan frontier, I tapped the power side of my clutch safety switch, and used a diode similar to the OP's method. Power is on here in on and start, and I kept acc power from the radio harness. Works well, as long as my battery is still charged to a certain extent. If the power gets to low my starter will draw below 9v. For auto trans pnp switch may be another option to do this from.
How to avoid Reboot when starting vehicle
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Just wanted to chime in on how I made this work for me. 07 Nissan frontier, I tapped the power side of my clutch safety switch, and used a diode similar to the OP's method. Power is on here in on and start, and I kept acc power from the radio harness. Works well, as long as my battery is still charged to a certain extent. If the power gets to low my starter will draw below 9v. For auto trans pnp switch may be another option to do this from.