1)now B+ ko battery ke main + terminal mien connect karna.
2)REM ko tape ki negative wali wire se connect karna.
3)GND ko seat ke nut ke sath connect karna thats all.
Buy 3 meter wire.
2 meter wire patli wali ap shop keeper ko kehna woh ap ko khud hi puri wiring de dega.
And at last buy good RCA cable.