Hello all: I have a 1993 Volvo 240 wagon. 185,000. miles. Auto Transm. B230F engine.

I’m having a strange electrical problem.

When the car is shut off. No key in the ignition, the red oil pressure light on the dash is glowing.

When I turn the ignition on (not cranking) all the dash lights come on (as they should) except for the oil pressure light.

I have done the following so far:

1. Removed the fuse block strip, removed all the fuses, cleaned them, and cleaned all the connectors (fuse and spade terminals), front and back, and put dielectric grease on all the fuse connections and spade terminals and re-installed.

2. Cleaned the connector at the oil pressure sensor on the engine block.

3. I believe all my ground connections are good, because I cleaned and dielectric greased all of them about 2-3 years ago.

One symptom recently (about 4 days ago) was a burning smell coming from the heat duct. I believe the large resistor on my blower motor is going bad.

Also, as weird as this sounds a weird buzzing noise intermittently came from behind the IP panel at that same time.

This occurred off and on for a day, and then stopped.

Even after these symptoms, it wasn’t until yesterday that the oil pressure light trouble started.

If you have any suggestions I would appreciate it. Thanks...Mr. Tool.
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Mr. Tool