Cars, Bikes and Trucks Diagnostic Interfaces  > Fiat pinouts
3-pin Fiat test connector
1 Black  K line (-) (to ECU)
2 White  K line (+)(to ECU)
3 Remaining pin Although any good earth will do

4 - Battery Power (+12v)-Direct to battery positive terminal


Middle pin is EARTH (battery minus)


First pin is the one near kennel (it is possibly white wire, NOT 100% sure, mistake will not harm your diagnostic hardware)

3 pins unspecified connector layout
3 pins unspecified connector
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