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Thanks so much for your advice. I have answered your questions in Italics. I know I am going to have some other questions soon. Thank you thank you
Is this the overhead dome lamps, the underdash courtesy lamps, or both?
Mine just has the courtesy lights in the sail panels. No dome or under dash lights.
The CSM wiring diagram shows three feeds on the load side of the STOP-DOME fuse. One to the clock that incorporates its own 2A fuse (though my guess is the clock's points are burned), one to the underdash courtesy lamps, and one that feeds both the dome lamp and brakelight switch. All ORANGE wires.
The dome and courtesy lamps share a common ground thru either the door jamb switches or the headlight switch, though it's kinda odd that neither works. Especially since the ground path for the courtesy lights is separate from the dome light and doesn't go thru either of the body wiring connectors. If they all went thru that, you could test for bad connection there.
OK--I will check that and give the headlight switch a once-over too
You say you know the sockets are fine. Have you used a voltmeter or test light to probe the ORANGE wire for 12V at all sockets? They can look fine and still be wacked.
Yes they are reading 12v, the white is 0v. A question, if the white one was working properly, whould I get a 12v reading on that?
Bulbs- you're using a double contact bulb in the underdash lights? think they're supposed to use a 90. Sailpanel and console lights too if equipped.
Yes I am using double contact bulbs
Next step is to test the WHITE ground wire for continuity at the headlight and door jamb switches. Also make sure someone hasn't put a big car H/L switch in there. They're identical except the F85 has the dome light switch, the big car doesn't.
The car is 100% original, I am the second owner. I don't think anything has ever been removed from it.
The WD is showing a 4-wire splice in the ground harness, but even if that had completely come apart or corroded, the underdash lamps should still be able to ground thru one of the door switches.
Have you popped the door jamb switches out to visual check or clean them? WD-40 can do amazing things here. After 44 years you may have some unseen corrosion between the switches and the car body.
yes I have popped them both out and tested them, they are working.
You may have to pull the fuse block and check behind it to make sure all three feeds are still connected to the load side fuse clip.
Yes I did that. All looked fine.
I recommend buying the 1964 service manual set. It has color wiring diagrams and invaluable service info. Get the 5-volume paper version as I hear the diagrams on the CD version are kinda poor quality.
I have the old paper books. They do have color diagrams. I'll take another look there.
Good luck.
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I know absolutely nothing about Oldsmobiles.
Just ask the owner of Oldspower.com
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