i blew a fuse when i hooked up the dimmer wire.
Also i had unwanted noise in the sub when i plugged it in.
The power antenna i just used a normal on off switch. It doesnt have enough drain on it to warrant a relay, with power on, it stays up, with power down, it goes down.
In the 80's toyota trucks you could actually get a power antenna switch if you want to keep it factory looking.

Even if you werent using amps, i'd still take out the factory one and leave it with the factory deck, the wiring harness only hooks up to the wiring that plugs into the amp anyways (the amp wiring wont connect to your deck/adaptor as you probably know)

I am geting some battery drain now, dont know what exactly it is, might be a combination of my scangauge and a dieing battery... dont know for sure...i know a few people on yotatech have had problems with their 3rd gen's a few years ago, maybe try searching there. dont remember this topic coming up here....