Not sure how exactly it was miswired but sent my pinouts via voltmeter continuity checks to A2B and Billy there confirmed it was an issue. Basically my brand new OEM Audi RS3 pump wouldn't prime/turn on and I was getting an engine code related to the fuel pump circuit, my external ground was very solid on bare metal. It is the exact same harness they bundle with their main RS3 brushless kits so I wouldn't worry about it and sounds like mine was an anomaly. At this point, they are sending me a new harness. Like it was mentioned above, the retrofit harness is based off 8V0971727A but I could never find how it was re-pinned for the GTI conversion.
Yea the flat shipping cost is high but I still came out way cheaper than buying the overall kit by sourcing my own pump/controller so it's all good. Unless someone wants to publish a specific guide on how to take that OEM harness and mod it for FWD/AWD MK7 along with a list of parts like the pump plug/pigtail, then A2B DIY harness is still the best way to go.
The parts list exists. I'm all for companies making money as long as they do it well. I'm hoping my harness works as it should and my time is not wasted. If it is, there may be a DIY guide that will be published with pinout information and part numbers. This is really very easy stuff. Getting the parts is a little difficult (some of it is back ordered) but people would be able to build the stuff themselves and make sure it's right. There is no excuse for this harness being pinned wrong. Nobody should need to worry if their harness is pinned wrong. Mine just got delivered so I'll be checking it tonight or tomorrow with a volt meter.
I see @scrllock posted the pin out. Check your harnesses guys.
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