Help...Car doesn't start. Later does.
 

So this morning I go out to start my car and it doesn't even turn over. I hear no noise whatsoever. No clicking like the battery's dead. All my accessories were working stereo, lights, windows, etc. I come back 7 hrs later and it fires off straight away. Anyone help? I'm a noobie so go easy on me. :confused: Oh and I have a 99 firebird ta a4. With no mods except for aftermarket amps headunit and a sub.

I have dealt with this problem twice already and no real solution.
Both of times it happened to my car is when it was raining heavily and water was in the car.

Car does this and then starts up after a few hours every single time.

Starter relay in the fuse box under the hood. Swap it out with a fan relay and see if it fires. 10:1 odds thats what it is.