There is no point putting and extra diode at the output, all it will do is drop the voltage a bit.
It will not provide any protection from reversing the battery, that would still cause extremely high currents.
All you can do to reduce the chance of damage is fit another fuse in one of the output leads.
It will not provide any protection from reversing the battery, that would still cause extremely high currents.
All you can do to reduce the chance of damage is fit another fuse in one of the output leads.