12a and 13b transmission harness

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05-15-24, 03:08 PM

Trevor E

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12a and 13b transmission harness

I need to replace the wiring harness for the transmission on my s3 13b. I can only find listings for 12a transmission harnesses and can’t find any info about if they are interchangeable, is it possible to put a 12a harness on a 13b?

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05-15-24, 11:37 PM

Richard Miller

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I believe there is a difference. I think the GSLSE adds a 5th gear switch that’s part of the ECU. You might be able to get a 12a harness and pin in the missing fifth gear lead.

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05-16-24, 07:45 PM

Trevor E

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Quote:

Originally Posted by Richard Miller

I believe there is a difference. I think the GSLSE adds a 5th gear switch that’s part of the ECU. You might be able to get a 12a harness and pin in the missing fifth gear lead.

So in theory it should work fine other than the 5th gear switch, that’s something I can pretty easily wire in after I get it started.

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