My wife and I recently completed our first long trip (9,300 miles) with our 2015 FC 20ft and TV (BMW X5). On the return leg, our AS running lights stopped working. I used a voltmeter to test the TV's 7 way plug. Some results are expected, but I would like input on what the others may mean.
I get 12V
between the power pin (upper R) and the neutral/ground pin (lower left) as expected, whether ignition is off or on.
With the TV R or L turn signals flashing, I show swings up to 12V
for the R or L turn signal pins (right and left pin position, respectively) and the neutral pin. Expected.
With TV headlights/tail lights on, I only see about 3-4 V on the running lights pin (upper left) and neutral pin. This seems wrong - shouldn't I be seeing 12V
here too? If so, I expect this is why my AS running lights aren't working.
However, even stranger....with the TV ignition switch and lights OFF, I still see about 3-4 V when I retest each of the turn signal pins, and the running light pins. Furthermore, I get 12V at the electric brake pin! Is any of this normal?
My hitch/trailer serviceman originally told me he had interfaced my BMW wiring with the 7 way plug wiring using some sort of electronic module, apparently designed to protect my TV circuits. With all this apparent weirdness in the 7 way plug test results, I'm suspecting the module has failed.
I would surely appreciate some expert answers to my questions....and please tell me which of my interpretations are valid, or not. Thanks!