I 'm in the middle of installing an OEM tow hitch on my 2004 330RX. When I thought I was done, I tested the electrical connector at the hitch with a voltmeter & got no reading at all. I contacted the dealer & was told I need to install a new junction block assembly because my RX was not equipped with a tow prep package. I've ordered one, but I have no idea on where & how it needs to be installed. I still have the rear cargo area disassembled for access to the electrical connector & floor grommet. Can anyone help me out with info on what I need to do to locate & install the new junction block when I receive it? Thanks!