I have the service manual for this GPS and it doesn't list the wire colors directly for the plug. This much I'm sure of:
RED-12 VOLTS (+)
BLACK-GROUND (-)
GREEN IS COMMON AND HOOKS TO CHASSIS OF GPS
THAT LEAVES THE BROWN AND YELLOW, BASED ON STANDARD DIN WIRE COLORS THE YELLOW IS LIKELY GPS OUPUT. HERE IS THE LINK TO THE SERVICE MANUAL. IF YOU OPEN UP THE UNIT THE WIRE COLORS SHOULD BE PRINTED ON THE CIRCUIT BOARD THAT THE PLUG IS ATTACHED TO.
http://www.pronav.no/engelske-manualer/ff50serv-eng.pdf
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the solution looks reasonable. however I have not succeeded maybe because I am awkward. I have still a TX error when I transmit the data.
Nevertheless many thanks for your help
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