Stereo help im tryin to install an aftermarket stereo in my sisters 1987 volvo 240 dl. i have the power wire from fuse 1-3rd prong after the fuse. power going into the head unit, and i have the unit grounded. stereo still does not come on. any suggestions to remedy the problem would be helpful

Most aftermarket stereos have two power wires, one for power, one to hold the memory, such as preset stations, etc. Usually they are red and yellow. Yellow is usually power from the battery (power all the time to hold the memory) and the red one is ignition power, usually.

Make sure the red wire on the unit is hooked up to power. The blue antenna wire is hooked up (or to the factory amplifier) and the yellow wire on the radio is hooked up to a key on power supply. If it works and you lose the memory when you shut the key off, switch the red and yellow wire power supplies.