CK 3100 and 99 Mazda Protege

Do you check the air and gas filters?

One of the light fixtures has a grounded power wire. Examine all light fixtures closely for bare or grounded wires. If you find nothing, trace the wiring harness to switch paying close attention to places where the wire harness passes through holes on the body for the harness. Any contact with the steel vehicle body from a power wire has the potential to cause a short, which will blow fuses faster than you can replace them. Start with the outside tail and marker lights. Also look for broken filaments inside the bulbs, as a broken filament touching another filament or wire inside the bulb can do the same thing. Good luck.

check for a bad ground, clean all connections,

It's not a fuse, your park lamps/tail lamps front and rear all get voltage from the same source. In the diagram, top wire is voltage bottom wire is ground. May be a problem with wiring circuit, either voltage or ground. Did you try pushing on the bulb to see if it would lite up, if it does, something wrong with bulb socket.

Some of the autoradio has the mute function already included to the autoradio, and when you add it, it may create troubles.

Then try without the mute cable connect and see if it is working.
Did you select the harness which the right reference of audio system?
You will have to ensure it.

a ground is a ground . take a small braided copper band attacch it to the chasis of the stereo and the other end to the car

Sometimes if its the factory harness, you can see fine print on the wires telling what each wire is for. If not, remember, red is hot,black is ground, and your smaller wires all colored purple,brown, gray, green, orange, blue..there will be two of each color, one with a black stripe, that is your ground for the speaker hook up..There also might be a yellow or light blue wire, test that wire for power when the key is off, that is your memory power supply.good luck.

u must of connected some thing which has connected the lihts re step what u did and disconct the radio

Check to make sure all the wiring is tight. That sounds like the connections are loose and loosing contact.

DID YOU TRIGGER THE AMP WITH THE BLUE WIRE TO TURN ON THE FACTORY AMP[IF IT HAS ONE]