Oldsmobile Questions? Ask a Mechanic for Answers ASAP
Hello. Are you able to turn off the headlights with the headlamp switch?
Try removing the plastic steering column cover and unplug the headlamp switch and see if they go out then.
Sounds good. If you unplug it and your lights go out, then you will need to replace the switch. This is what I am suspecting is going to be the problem. Let me know. Thanks
They stayed lit with the switch unplugged?
is it the daytime running lights that are on?
That was my next thought. Check continuity on the switch between the light green and tan terminals while holding the plunger all the way in. If there is no continuity then the switch is bad
I don't think that's what's causing this to happen. I am going to open this question up in case one of the other experts has experienced this before and can tell you for sure what's causing this. If someone knows they will reply shortly.
Hi There, I'm Clay a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
From your conversation and the symptoms you're experiencing sounds like power or ground is back feeding through the headlamps circuit and keeping the head and tail lamps on. Just to make sure, you disconnected the 23 way connector (headlamp switch) and the headlamps stayed on?
With the battery charged enough to operate the headlamps, remove these 4 fuses one at a time and see if the head and tail lamps turn off.
Underhood Fuse BlockHDLP R Fuse 15 ampLP PARK Fuse 20 ampHDLP L Fuse 15 amp
Interior Fuse BlockRADIO-HVAC Fuse 15 amp
Let me know if one of these fuses or a combination of the fuses changes the lamps operation. Also the headlamp switch connector you disconnected and the lamps stayed on. Was it a 23 way connector?
I'll be here most all of today. Let me know what all you find.