A reason not obvious could be the trunk light bulb which is on the same circuit. We had a case where the bulb looked good, but the filament was loose and would sometimes connect ok and sometimes short. The only case where the fuse would blow was when you opend the trunk AND the filament decided to short. Prior to diagnosing this, the dealer told us it was the radio which we had removed, but which didn't solve the problem. or at least rules out another part of the puzzle.
because its got spirit
It would be cheaper and easier to replace the whole radio.
Check to make sure that your power wire on the radio is not grounding to the body of the radio. this will cause a short and thus blow the fuse.
i have a 95 Spirit and have the same problem. It is getting power to the radio (back lit, and tape player will rewind, but the clock display doesnt work, and the radio doesnt work (which sucks). Sometimes it will turn on when I start my car, but once the car is running, there is 0% chance of the radio coming on, even if I start banging around the radio. THis leads me to believe that is not a loose wire, but something in the ignition? Any input would be appreciated! I to had the same prob with the radio in a 90 Caravan which also carrys the same radio setup as the Dodge Spirit... its a short in the radio that aventually developes... theres nothing wrong with wiring... i took the radio setup out of my 92 Spirit (cause trans went out) and put it into the Caravan and still works fine, so its not a wiring prob... just a prob with the radio itself.
A short in the wiring.
"Radar" comes from RAdio Detection And Ranging. If it didn't use radio it would be called something else.LIDAR (LIght Detection And Ranging) is laser instead of radio. That uses light.
If you mean can you plug a radio into an outlet controlled by a light switch, the answer is yes, provided the radio does not draw more current that the circuit can supply. (This would not apply to your standard household radio, but only to a high powered unit.)
you probally have a bad wire that is shorting out and blowing your fuses.
i replaced the head unit and the fuse stoped blowing.
Short in the wiring or one of the bulb receptacles.
That would probably be bad valve seals. It would depend on the vehicle as to how easy or hard it would be to repair.