83 Temp Gauge Problem
 

I was examining my instrument cluster to figure out why only half of my instrument light were functioning. When I reassembled it my temp gauge would peak and stay there. (It would peak after it warmed up, or if I turned the lights on). I removed the dash board again and repaired a crack in the circuit board. After doing this, the temp gauges does work, EXCEPT when I use the "high beam" on the head lights. Can anyone tell me why this would only happen on the "high beam?"

Thanks, Brian

crossed wires
 

Or bad grounds

That is your problem. Find a used one to replace it with.

temporary ground
 

Thanks for the help. I was wondering if there was a way to attach a temporary ground to the back of the instrument cluster?

Brian, what vehicle have a bunch of cluster components for 126's that I am about ready to toss.

Instrument Cluster
 

I have an 1983 240D (123 series). I temporarily fixed the problem. I added a ground wire to the back of the fuel gauge and grounded it onto the dashboard sub frame where everything else is grounded. It seems to have worked. I believe it even fixed the fuel gauge which hasn't worked for years. I am hesitant to replace the instrument cluster. What do you do about the odometer reading?

Just swap the spedometers from one instrument cluster to the other.

the fure/oil/temp, spedo, and the tach or clock for the 240 are three seperate units.

Charlie ☺