Hi, I'm new to group and could really use some of your expert help and experiences. My 1992 535i will not not start unless I jump car from under the hood at jump block. Battery is charged. Alternator is working. I have to connect jumper cables from battery under back seat to front compartment.
Bought car recently and I'm not sure what all is connected and operative under back seat (like alarm and old cell phone components. I cleaned and checked bat cables Any ideas as to what might be inhibiting power from getting to starter from bat?