Hey Sue I went ahead and checked, and it does not look like there is a plug and play wiring adapter for your 2024 Subaru Ascent unfortunately.
It looks like in order to use the Tekonsha Primus IQ Trailer Brake Controller # TK90160 you're going to have to use the included universal wiring harness.
You could also use the Curt Echo Wireless Brake Controller # C51180 which plugs into your factory 7 way, so it wouldn't require any splicing or cutting into your wiring. view full answer...
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