John Ross 1998 Roadtrek 190 Rear speakers, no sound
I removed the front drivers seat, and found what I thought was an amplifier, it wasn't it was for the airbags.
Anyway, while there I tidied up the wires and checked harness connectors for tightness.
Put everything back together.
Then I proceeded to remove the dash to get at the radio again, to check the output at the radio. Previously I had tried to get a signal tracer, but was unable to find one, even at The Source, the old Radio Shack. They didn't have one but they could order one, maybe.
I then remembered I had an oscilloscope from my old days of repairing electronic organs, so i was going to use that to signal trace.
I turned on the radio while taking the dash apart, lo and behold the rear speakers were working, so it was abad connection under the drivers seat.
Thank you Gallen, I find that in my older years my mind does not work as well as it did. You got me thinking in a logical way.