Freaky fuse 21 problem
My 318i keeps blowing fuse #21 (instantly). I traced it to a 4 pin plug under the drivers side dash, and when I unplug that plug the fuse no longer blows. The funny thing is that the plug appears to go to the radio but I have the same problem even if I disconnect the radio. To make matters even more confusing if I check continuity to ground it is present at the fuse with the under dash plug connected, not present at the fuse when the under dash plug is disconnected, not present on any of the 4 pins on the under dash plug, but present on all 4 pins of the socket that it plugs into (?!?).
Im really lost and would appreciate any input, and if anyone is willing to share the under-dash wiring diagrams for my car please let me know!