It sounds like you have a 7-way trailer socket on your 2008 Saab 9-7X that has no signals on the 12V charging circuit nor on the brake controller output circuit. If you refer to the linked photo you'll see the usual pin/function assignments typically found on an RV-style 7-way. Often the 12V trailer power circuit is carried on the pin at the 1-o-clock position and the brake controller output is carried on the pin at the 5-o-clock position.
The most common causes for an issue like this... view full answer...
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