The sub is in and really sounds terrific, I still have the factory CDR 210 with all the original 6 Nokia speakers and the 6 channel Nokia amp. I wired the 12V switched hot to the amp from a fuse that gets hot when I turn the key, the amp turns on, works great but not the way I want it to because if I sit in the car listening to the radio I have to have the key turned to power the sub.

I tried to pick up a hot at the amp in the front trunk by my '99 must be different its a Nokia Amp. There is no A7 red/black at my amp. With a test light I have one hot at the amp that works just like the fuse I picked up, key turned-hot, key off-no power.

Can anyone help me out here to locate a hot that will come on when the radio is on and off when the radio is off?

https://www.6speedonline.com/forums/...rear-subs.html

 

I am purely speculating at this point, but I would guess the radio might have a remote turn on for the factory amp. You can pull the factory radio and use your test light to see. If you find one, I would toss an inline fuse on the remote turn on lead running to the amp just to avoid killing the factory radio if something goes wrong.

You could do the same using the switched lead that powers the radio if worst comes to worst...