Radio Problem

I once grounded my stereo to my dash light power feed! Heck, it tested as a ground when I probed it...duh! I would turn the radio on and then my lights and poof, blown fuse. I would replace the fuse and it would happen again. pulled the antenna lead and it would hold, but as soon as I touched the antenna lead to radio with lights on, pop. Funny once I figured it out. Power it up straight to battery., Easy enough to turn the radio off when you pull the key. Itll retain the presets too if its that style.