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The saga continues... Got my trusty multimeter out and did some testing
Alpine Amp:
White Wire (Remote Wire):
Ignition Key Off, Radio Off - 0.00V
Ignition Key ACC, Boardmonitor Radio Off - ~11.5V
Ignition Key ACC, Boardmonitor Radio On - ~11.5V
Radio Control Unit:
Pin 5, 12V Continuous (Violet / White):
Ignition Key Off, Boarmonitor Radio Off - ~11.5V
Ignition Key ACC, Boardmonitor Radio Off - ~11.5V
Ignition Key ACC, Boardmonitor Radion On - ~11.5V
Pin 9, 12V Switched:
Ignition Key Off, Boarmonitor Radio Off - 0.00V
Ignition Key ACC, Boardmonitor Radio Off - ~11.5V
Ignition Key ACC, Boardmonitor Radion On - ~11.5V
Pin 16, Remote Power (White):
Ignition Key Off, Boarmonitor Radio Off - 0.00V
Ignition Key ACC, Boardmonitor Radio Off - ~11.5V
Ignition Key ACC, Boardmonitor Radion On - ~11.5V
This tells me the radio control unit, stock Alpine Amp, and my aftermarket MTX amp are all staying powered on when the sounds cuts off after a couple minutes when unplugging the boardmonitor. Guessing the RCU senses the BM HU is off / gone and shuts off the main L/R +/- outputs to the amp.
I am going to try one last thing which I think may work - wiring the L/R +/- line level outputs of the eonon HU directly to the corresponding pins on the 17-pin round connector. I think these are always "active" to the amp. I have a really long 18AWG speaker wire to test with. If this works I will probably just hijack two pair of wires from the NAV harness to run to the X18126.
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