Data link is low voltage I do beleive, and I don't think it is just 'on' or 'off', I am not sure what protocol it uses to communicate.....

 

it was low volt but had ground not power and the diagram said it was a power not ground but there might be a problem before the computer with the data link I’ll have to test wires but I gotta get it running first because it lost fuel prime over night as I had the fuel pump off