ST290 GPS and NMEA issues

[smorast]

Steve,

Please take a look at the photos on slide 2 again please. The red seatalk red and shield lines are actually connected to the DPU power input lines.

When I disconnect the seatalk red line from its current location, will I not be removing power from the unit?
My assumption of what I will need in the end is:

1.Seatalk yellow and shield to DPU seatalk inputs and leave seatalk red disconnected.
2. Install new 12vdc and ground line and hook up to DPU power input.
Or
2a. Do nothing as the DPU is powered from ST2 red wire...

Help..and apologies for confusion.