I have been on an extended break from installing car audio for nearly 10 years..... Children and new jobs and moving..... Now, I finally have some time and the facilities to do some work and I can't seem to get things to work. I have a 2010 Expedition with the Navigation factory system. I am trying to start the install process out by adding an amp and subs. I am attempting to use a Dayton DSP 408 to control the signal. So far I am coming up all zeros..... I have tapped almost every wire in the vehicle trying to find a speaker level to use on the DSP. I have consulted all the information I can find and still can't seem to get anything to go. I have tapped at the factory amp, behind the factory radio, and at the sub amp. All coming up with nothing. I am trying to get the signal to a couple of old Infinity 611a amps and a couple of Ascendant Audio 12's. This is the first stage in trying to revamp the Expedition. I can't tell if I can't figure out the DSP or not. Parts Express was very helpful, I just don't know what is going on.
If anyone has any ideas or anything that can help, I would be very grateful. I am in Eastern Iowa as well, if anyone wants to drop by and help.