I have three cables in all going to the +ve terminal
The huge one that goes to the starter motor via the engine loom. As I remember this also goes to the alternator.
A medium sized one (guessing about 6-8mm cross section) that goes directly to the BMW fusebox. This is the main feed for all the electrics except the engine management.
A smaller one, 4mm ish, that includes an inline fuse that goes to the engine loom that powers the engine management systems.
Robin
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