gusmac wrote:
The meter isn't getting pulses to tell it the vehicle is moving (or how fast). Most likely a bad connection in the pulse wire.
or a cambus wire broken green/white twisted wire
its it a auto then check the wire beside the gear stick (left hand side as you look down)
if you have diagnostic then check the dash board if fault shows then thats your problem
may also be a problem with the fuse box under the bonnet (this is a major problem with mercs, easy to change as all the wires just plug in under it (called sam unit... this is where i place my money)
we run a fleet of mercs and i have to fix them
i hope he has not taken the the pulse from the ecu socket, also has he taken the earth wire from a earth point from the body and not tapped into what he thinks is a earth( again cam wire)
never tap into other earth or 12v wires from other equipment
daz