Notes On The Use Of Paint Scraping Nuts On Ground Connections - AH00.19-P-1000-20A

MODEL 117, 156, 166, 172, 176, 177, 190, 205, 213, 217, 222, 238, 242, 246, 253, 257, 292

Courtesy of MERCEDES-BENZ USA

As of model 172 the concept for contacting electrical ground connections to the body has been altered. All body ground connections are covered-up in the production process with a coat of paint.

IMPORTANT: Only the newly developed paint-scraping nut (2) may be used for threaded ground connections. This is to establish an electrically conductive connection to the body through a painted ground connection in a process-consistent way. The paint is worn away when the paint-scraping nut (2) is screwed on. This enables an electrical connection to be made between the outer thread of the ground connection and the inside thread of the paint-scraping nut (2).

The use of other nuts that deviate from the specified paint-chafing nut (2) (e.g. for retrofits, repairs) may lead to a complaint.

The following should still be observed:

Assignment of new ground connections:
If, when retrofiting, a ground connection that was not previously used is assigned, make sure that the contact surface of cable lug (1) is flat (no welding splatter etc.). Otherwise, there may be distortion or deformation to the cable lug (1) when screwing on.
Repeated use of paint-scraping nut (2):
Before screwing the paint-scraping nut (2) onto the ground connection again, paint abrasion in the grooves must be removed (e.g. using compressed air).
Paintwork rectification in ground connection area:
To avoid any excessively thick paint coats, paintwork protection must be applied to the connection prior to any paintwork rectification in the ground connection area (e.g. screwed-on nut or cap).