'04 Explorer, New H.U./ Bad Reception

Just installed a new JVC CD/MP3 unit in an '04 Explorer.  Had the unit in an '02 F250 and all was fine. After the install in the Explorer, the radio reception is terrible (almost non existent).  Any ideas?? I double checked, the antenna was plugged in completely.

Thanks for any info.

Bill

The antenna is not in the glass.  Do I need a special connector to adapt the factory antenna cable?  It seemed to fit just fine and look pretty standard.  It just acts like there is not antenna there at all.

Another note: The factory wiring harness has two plugs. The one has all the power and speaker connections.  Not sure what the other was for. It only has two wires on it.  Could the antenna be grounded with the other plug?

Thanks

The OE radio was working fine and had good reception just prior to removing it.

i'll try it, but i am just reinstalling the JVC from another vehicle and it woked fine there...

Maybe the question I should ask is if there is anything different about the new ford antennas? and what the two wires on the other plug that came out of the factory unit are for?

I had the JVC in a '02 Ford F250 and it worked great, radio and all. 

I put it in the '04 Explorer and the reception is bad.

I understand that you used to use it in an f250. But have you tested the jvc to see if it works since you installed it in the explorer?  I'm not sure what the 2 extra wires do but they could supply a 12 volt to the antenna module if your vehicle is equipped with one. Normally you have the module if the antenna is in the glass. I would plug your oem radio back in, and leave the harness with 2 wires disconnected and see if it affects the radio reception that would tell you allot. If you do not get radio reception with that 2 wire harness disconnected then it will need to be supplied with a 12 volt.