Robert,

The mentioned dash light problem (on-off-on) is quiet common. Have all the dash cluster bulbs (4) renewed during the next service (whether they function properly or not during the service). The bulbs are definitely worn; it is (most likely) not a ground problem.

greetingz,

__________________
1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)