Hello, finally picked up a project ( I know, I know, lol) Series 3 spider that I understand cranks but no fire - I think tank/fuel is suspect as fuel is clearly old so need to drain/treat tank. Also learned that the Bosch cars need all their volts so a new battery should be installed if I can not properly bring old battery up to charge. Intake duct has holes (will repair this while a source new duct intake) and chase down other vac leaks. My question is how many electrical grounds do I need to find and clean on a '83 spider? I understand that poor grounds on these cars can create a lot of trouble and non start issues - does anyone have a diagram or sticky on these grounds and their locations? Thanks!