I am going to be installing my EDFC unit into the empty NAV spot, and wanted to know if it was a bad idea to tap the constant and switched power lines from the radio area?

Should I run all new wires to the fuse box, or will the same radio wires do the trick? Think i'll introduce any extra noise to the radio this way?

 

It shouldn't add radio noise as long as it is well insulated.

 

I would not suspect noise unless you introduce a poor ground which should not happen as you are using the radio ground unless you make a poor connection. The only thing I would be worried about is whether running both the radio and the tein unit on the same circuit would exceed the capacity of the circuit. I'd be sure that I added up the draw of both before I added the tein unit

 

I think the current draw will be fine, as I have seen people add their Sattelite Radio, or NAV/Video screen on the same fused circuit. The EDFC unit doens't look like it would draw a ton either... fairly simple unit. I'll double check the numbers before I dive into it though.

Thanks!