Translation of this page is incomplete.
Collection of all electrical (plus and minus) connections (in work). Click on pictures to enlarge.
Corresponding threads in dmctalk.org:
DeLorean Ground Schematic
Ground Location List
Voltage Drop Testing (checklists by www.aa1car.com)
There are multiple mass connections behind the Frontlight.
Near the fan slots within the Center Console.
Right side of the Radio / A/C Metal Bracket (dash). Center Console to be unmounted.
Passenger side behind the parcel board. The parcel shelf wall to be unmounted.
Drivers side, under the parcel shelf with the ECU mountings & harnesses.
Ein Massekabel geht auf die Schraube, die den 'Vacuum advance solenoid' an den Gemischregler befestigt.
There is a important connection between frame and E-Box right under the jump start log.
Passengers side, connection between engine and engine mount.
Passengers side, on the forward side of the intake manifold, with a red heat shrink & blade connector. This one comes from a harness & if unplugged causes the Lambda system to not operate correctly.
There's a connector with about 9 terminals, one is ground, that's parked inside the washer bottle cover. But it's not technically a "ground point". But it does ground much of the dashboard area! The black cover with the bottle inside it that's held on with way too many rusty screws. You can usually pull the cable out and get to the plug without taking the cover off. Carefully pull out the grommet that's right next to the cover.
There are frame connections behind of each rear light (only for anti static reason, can be ignored)