944T New Harness Relay Box - Sanity Check

Talk and Tech about turbocharged 924/944/968 cars
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AudiSport
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Bergerac wrote: Thu Nov 13, 2025 6:36 pm
Like I said, you need to sit down and understand the drawing, what the relays do and how the engine harness interfaces with the dash and body harness. Audisport has given you the answer.
Bingo. I spent months going over the Maxx manual/help pages and factory diagrams. Very important to understand the functions of all the input/outputs on Maxx. My goal was to make plug in harness for Maxx that didn't involve cutting or hacking any of the factory stuff. Everything right now plugs in to OE interfaces (basically the 14 pin connector and 8 pin). But it's also converted to sequential with cam sensor..

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944m3
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Great info.

Another related question. What size wire did you use for your power and ground pins? I’m thinking of using 16awg but need to make sure it fits into the connector pin slots.

Definitely have further studying and learning to do.

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Bergerac
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944m3 wrote: Wed Nov 12, 2025 8:57 pm “Then I wired out a GPO to a relay so I can have the ECU shut off power to the AC say at heavy throttle...”

Cool. Was this a separate relay outside of the stock fuse box?
If you split the wire between the A/C switch and the A/C relay you dont even need a seperate relay, just use the switch side as the A/C demand input and the relay side as the A/C Clutch trigger output.

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944m3
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AudiSport wrote: Thu Nov 13, 2025 7:36 pm
Bergerac wrote: Thu Nov 13, 2025 6:36 pm
Like I said, you need to sit down and understand the drawing, what the relays do and how the engine harness interfaces with the dash and body harness. Audisport has given you the answer.
Bingo. I spent months going over the Maxx manual/help pages and factory diagrams. Very important to understand the functions of all the input/outputs on Maxx. My goal was to make plug in harness for Maxx that didn't involve cutting or hacking any of the factory stuff. Everything right now plugs in to OE interfaces (basically the 14 pin connector and 8 pin). But it's also converted to sequential with cam sensor..
I’m also thinking of going sequential. Did you use CoP? Which ones? Any difference in drivability or MPG?

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