If you are refeing to the actual car fuses, you may have put too large of a fuse in and blown the radio's fuse. on most radios, there is a fuse that sits in the back of the radio. just pull out the radio and see if that is the problem
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It sounds like the remote turn on wire from the radio no longer outputs power. You can try connecting the the remote turn on wire from the amp to the accessory power of the radio. Place a 10 amp fuse in line just in case the issue is the amp.
If the negative ground was not disconnected, you may have popped a fuse on the radio, if it has one. Check the back of the radio and the fuses there. Always remember to disconnect the ground when working with the electrical system.
MOST OF THE TIME THE CONSTANT CAN NOT BE HOOKED UP TO THE SAME WIRE AS THE POWER WIRE, U SHOULD HAVE A WIRE IN UR HARNESS THAT IS YELLOW USE THAT WIRE, IF U DONT FIND A FUSE INSIDE UR CAB USE THE FUSE AS A CONSTANT POWER LEAD BUT PUT IT ON ONE THAT CUTS ON WITH THE KEY.
if you dont have a 12volt power supply, you can test the headunit by connecting your yellow, red, and black wires directly to a car battery. connect the yellow and red wires to the positive terminal and the black wire to the negative terminal. Before doing this make sure the red wire has the small inline resistor supplied by pioneer and the yellow wire has a 10amp fuse.
You must connect the constant hot wire (or there is a fuse blown somewhere).... it should either be orange or yellow at the rear of the pioneer radio ... it should be connected to a wire that recieves power even when the key is off ... that wire will depend on the car itself ... if you used a connector to plug into the factory wires (a good idea) that connecter should have a yellow wire that would supply a constant "hot" for your pioneer, if it doesn't there should be a fuse blown in the car fuse box.
If your radio is the pioneer model stated, it definately has a fuse!
The little black box on the yellow wire contains a fuse.
If there is no black box on the conctant power, you may have damaged the radio with a voltage spike(s) when connecting the battery posts.
Take the unit out of the dash. In the back of the unit, disconnect/remove the wiring connector. Underneath a little "flap" on the bottom of this connector there is a small red 10V fuse. That fuse had blown, and when I replaced it the CD?radio worked just fine.