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12a and 13b transmission harness

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Old May 15, 2024 | 03:08 PM
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Trevor E's Avatar
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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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Old May 15, 2024 | 11:37 PM
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Richard Miller's Avatar
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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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Old May 16, 2024 | 07:45 PM
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Trevor E's Avatar
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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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