What Kind of Car, and what Model Nav Deck?

97 plymouth neon I've hooked up decks befour but never the double din alipine model IVA-W205

Up top my bad also for some odd resone I have no taillights or dash lights will that affect it?

You will want Good wire Large enough to go from the Amp, Directly to the Battery with a Fuse Large enough for this setup, at the Battery on the Positive, I will have to check out the specs.
You may have to turn off the system when going up hills.

Kidding,
Should be fine as long as you are running, Could have external power when parked?