Try a jumper cable as mentioned above. You can also make some jumpers by buying an alligator clip assortment at Harbor Freight. Maybe get some contact cleaner and get the corrosion off the terminals.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,