I'm no expert here; that being said, what I've seen for ground straps on Porsche's are bare cable grounds (no insulation). That is on both the transmission ground and the battery ground (even the ground to the engine lid). Red usually means hot (positive).
There is no telling what a PO has done, and you know your car better than I. Good luck
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1982 930, K-27, BL adj. WUR, Rarlyl8 Headers and Hooligan muffler, MSD 6, 22 and 30mm torsion bars, poly bronze bushings 30mm raised spindles and custom valved Bilstein shocks (by Elephant Racing), monoballs front and rear (by Rennline), Alton 17" Fuchs, Fred Cook fuse panel
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