I have a sudden power drain that kills the battery in a day or two.

By pulling fuses, I've narrowed it down to the radio circuit.

It is the factory navigation setup -- no mods. Any thoughts on what would cause it starting a quick drain?

Thanks!

 

You could pull/disconnect the radio and see if draw stops.

 

Is the ignition switch original? Key hard to remove at all?

 

^Could be ignition= hard to believe the weird things that can be connected with this on our cars?

 

I don't think I was clear. By pulling fuses and disconnecting the radio, the draw stops when the radio is disconnected.

Could this still be the ignition switch? I guess that makes sense as the radio would be a big draw if it is the ignition switch.

 

When my first switch failed the key was tough to remove and my headlights and AC worked only sporadically. I bought a cheap replacement that was either bad or went bad quickly. My battery died FAST and weird things like a soft hum under the dash was occurring when the key was out. One day it began to rain and my wipers came on with th rain sense - I was watching from 100 yards away! The ignition switch is full of little brass fingers and while I'm not sure how the heck it goes bad the weird ways it does when it goes bad circuits that are supposed to be off or on act like ghosts in the machine. I put in a good Bosch switch and my battery can go weeks without issue. I did finally a year later have to swap the headlight switch out lol. Usually the first symptom is the key being difficult to remove but the second wonky switch was smooth.

 

Pays to buy a good quality switch as BLKMJK point out= not that expensive.