2000 Grand Caravan speaker issues

I recently installed an after market cd player in a friends van. I used a multimeter and found the constant, power, and used a battery to find the
positions of the speakers and all that. The problem I have is I can only find the rear speakers. None of the wires are providing static to front speakers. There are none in the doors, I checked under the panels but did not want to pull the dash apart to check for those speakers until I asked for some help.
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