Last week I wrote that my high beams and wipers didn't work. Aye Roll replied that I should check the headlight relay and fuses. I did. There was some corrosion and I cleaned it up. No improvement.

On Thursday the horn quit working.

I've had an idle problem that would sometimes cause the engine to die. I was living with it. Late last week it was dying more frequently, and sometimes would die and only the oil pressure warning light would illuminate - not the row of lights you normally get.

When under the hood fiddling with the headlight relay, I noticed that the battery terminals were beginning to cake up with that white powdery residue quite heavily. I cleaned it all up this morning. The negative cable connector cleaned up but part of it looked like copper. Took the car for a 20 minute spin just now, and the negative cable connector is completely frosted over with whire residue again.

Obviously I have an electrical problem. I'm guessing something significant, potentially disabling, and possibly damaging to other components. Any suggestions about what it might be, or where to start looking?

Thanks.

PS. Fixed the idle problem by cleaning the throttle body.