Originally Posted by davidls77
thanks for the quick reply!
hmm.. how do i check which signal (front/rear) you are referring to?
this is the first time i've used the FAST harness, so I thought it was pretty much a plug-n-play type thing?
i'm used to using after-market stereos and using the RCA low-level connections, so i don't really know what/how to check...
The FAST Harness is plug and play. On your headunit, fade all the way to the front speakers and then the rear speakers to see if you get any volume from the Tube.