Hey guys. Looking for a little advice. I was attempting to replace the head unit in my father-in-law's car, and wasn't getting power for a bit. Now, the only way to get power is tying the red wire (ignition) and yellow wire (battery) together. However, when the engine is shut off, it loses all presets. I'm assuming it's a head unit issue right now, but could it be an issue with the constant flow from the battery? No known blown fuses, as I've already check them all with a 12v tester. Let me know where you think I should look. Thanks.