Where is the negative terminal under the driver's seat?

Trying to wire a rear view camera. Located EK1(?) D+, B+, positive terminals. Where do I wire my negative?

EK1
https://sprinter-source.com/forum/picture.php?albumid=770&pictureid=5007

There are two bolts welded to the floor within the pedestal.
Follow the brown wires!

Not that you asked:

The third EK1 terminal is Terminal 15, which is the key RUN/START signal.
The EK1’s D+ signal is activated by the Instrument Cluster a moment after the engine fires up.

Both of these are isolated by relays located on the front rail under the seat.
Consult your side cover’s list should you ever need to locate them.

-dave

You can wire the negative to any bolt near the camera

NelsonSprinter said:

You can wire the negative to any bolt near the camera

Click to expand...

Of course you can. Sorry for the tunnel vision there.
(there’s a ground bolt for the tail lamps in the side panel... again, follow the brown wires)

-dave