Well we have a short in our 99 izusu rodeo.car was fine when we baught it and now it has a short causing the marker lights to go out.. put fuses in an it kept blowing. it didnt start acting up until we took it to best buy and got new speakers and cd player installed.. checked the speakers but couldnt find anything wrong..can you help me?

If you just had a radio installed and your marker lights are blowing the fuse then whoever installed your radio hooked up the dimmer wire incorrectly, it either needs to be capped off or taped up, it's probably connected to the radio's dimmer input to the wrong polarity

Ck to make sure the radio itself is not pinching any wires wiggle the wiring harness around .. a blown fuse is a direct short but also try this disconect one marker lite at a time you could have one bad marker lite causing the problem it could be just a coincidense with the radio installation