i bought a new 03 350z and the red cable connected to the positive terminal isn’t there and it’s no where listed on the internet how to install that wire nor what it connects to im pretty lost. trying to hook up a aftermarket radio and i need that cable connected to have music correct ?

 

Ummm... There's no wire connected to the positive terminal of the battery?

How does it even start?

 

He means in the radio harness.

Yes, there is a wire. Buy the adapter harness. Unless you already cut off your factory plug (I don't get why people do that. Dumb idea). The adapter harness just plugs into your factory plug and the wires on the adapter are color keyed to any aftermarket radio.