Good Afternoon All,

88 245 GL

My temperature and gas gauge do not function properly. The temp gauge never gets higher than 1/3 and my gas gauge is completely dead. It is contantly pinned at zero as if it is disconnected. I was wondering if these two gauges are related? I removed the cluster and tightened the bolts that fasten these gauges as well as disconnected and reconnected the wires on the rear of the cluster. It did not fix the problem. I inspected the wiring harness under the hood against the firewall and noticed the blue wire on the driver's side was disconnected. The other wires (black, yellow/blue, yellow, and red were connected (upper right - counterclockwise in the 6 pin connecter, respectively). What is the purpose of the blue wire and where on the wiring harness does it connnect?

Thank you!

If you are having problems with both gauges that is a symptom of a bad voltage stabilizer, which is the little thing that looks like a transistor mounted to the back of the instrument cluster. It controls both gauges so if both are whacky the voltage stabilizer is the first suspect. FCP sells them for $8:

http://www.fcpgroton.com/volvo240other.htm

While you've got it apart, you might want to bypass your temperature compensator board. Or at least take it out and clean up the contacts.

I don't know what the blue wire is, but I've got one and it's not hooked up either. My guess is that it's for an option like cruise control or maybe an optional gauge.