PeachParts Mercedes-Benz Forum - View Single Post - 1989 300CE Tachometer/Clock/Oil Pressure problems

JamesDean · #2 10-14-2013, 12:55 PM

I would agree with your assessment, looks like the ground wire to me. I can't quite see underneath, it looks like it runs to a blue/green cylinder. Might be the ground connection on the device that runs the oil pressure gauge.

Without a ground connection the oil pressure gauge won't work, so, in theory restoring that would restore functionality. But why the trace blew up in the first place is the main question here. Thats a pretty lengthy bit of trace be all missing too.

I think the tach/clock pod can be powered up separately from the oil/fuel/vac gauge pod. I would try doing just that, power them up separately. I can't remember what the connectors look like though, you might need an alligator clip wire to provide ground for the clock. I seem to remember it having a single 12V connection. Might be the same case for the tach. It might have a two pin connector.

Wonder what caused all of this. Any alternator issues? Maybe voltage spiked? We have the OVP for protection but it does not protect everything. Its only hooked into a few key engine electronics units.