there may be, most likely is more than one positive wire going to that radio, you need a wiring diagram for the car you removed the radio from.
and you nee done for your car.
We do not have Manuals for peoples cars, it is expected when you need help that you have a manual and wiring diagrams for the car your working on.
Your complicating matters for yourself by having a different radio that your trying to stuff in your car.
This can be done but it is up to your to follow though with your dream and buy the necessary tools to do the job.
Not one person here has the same car as you and has chosen to put the exact radio you purchased in it.
This is your baby your project your expense.
This would be different if your installing a aftermarket radio in your car, nearly anyone could help you with that if they had the manual for your car with the wiring diagram.