Excellent so you will be able to work your way through it .
So many people fall to pieces the instant they look at a wire , must be the witches spells .
The only thing that is vital to do is remove the blower housing and take the kill wires off the magnetos.
They use a Hall effect chip to time the sparks and if it ever sees battery voltage you fry it $$$$
So once all done I start the mower & run through all of the controls with a test lamp between the kill wire & ground and check that it never flashes .
The wiring diagram is the first page of the IPL which can be downloaded from
Husqvarna directly
Had a quick look at it and not a big deal but you will have to add some terminals to the Brake/Clutch switch plug & the PTO switch plug and a toggle for the MIR circuit.
It will need to be wired according to a pre smart switch diagram circuit and GT48DXLS CARB / 96043023300 ( 2017) seem to be the last one with standard wiring .
The cranking circuit is a daisy chain
Key switch > PTO switch > parking brake switch > solenoid trigger wire .
Ignition is 2 circuits
Magneto + Ground ( open to run closed when off )
Battery + carb solenoid
And the safety circuits
Seat + PTO + magneto
Seat + parking brake + magneto
RIO + PTO + magneto
are all parallel