I have an APM 2.8 with latest firmware uploaded. I have one of the Ublox 6m GPS/Compass modules with a six wire cord coming from the corner of the Ublox module. The wires split to 2 and 4 into DF connectors (4 GPS & 2 Compass). I connect the wires to the APM and I do not get any lights on the Ublox module. I thought I might have a bad module, so I connected another one to the APM and still got no lights. I measured voltage on Pin Out on APM and I have 5 Volts on GPS pins. I have another APM 2.8 with same set up and it works. If I unplug the compass and put the jumper on the APM 2.8, I can get the internal compass working. Even though there is no light on the Ublox, I can get 5 or 6 satellites, but they positions drifts badly. I expect the GPS might be getting some feedback current enough to provide some weak signal.
I have tried most everything but cannot figure it out. Does anyone have any ideas? Does anyone have a detailed wiring diagram for the ublox and the pin outs on the APM showing the pin IDs (Volts In, TX, RX,Grnd, Compass).
Any help will be appreciated.
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