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Headlight weirdness and opinions/advice needed

Steve in SLO

Member
Feb 8, 2020
47
59
San Luis Obispo, CA
Hi all,
Roadster number 364 flashed me a low beam or dip light warning last week as I started it. I clicked it off without really looking at it (my bad). Since that time, my headlight behavior has changed dramatically. The headlights turn on when the ignition is turned on no matter what position the switch is in, and remain on for several minutes after I pull the key out, even after locking the car. They also turn on when the car is being charged. While driving, the highbeams are on in all dash switch positions, but the low beans are either off or at reduced wattage in the ‘off’ or ‘parking light’ position. Both beams are on in the ‘on’ position. I get a slight bump in light output when I click the stock switch to highbeam, which makes me think that the high beams are running and slightly reduced wattage at other times. I am running halogens in all four bulbs.
Any ideas from the group would be welcomed. Thanks.
 

X.l.r.8

Supporting Member
Feb 18, 2018
1,500
933
Toronto/Miami
That’s was quite confusing. Exactly which lights are staying on, mains/high or dipped, as they are 2 different bulbs. It sounds like the switch panel is giving the same feed as it does to the cigarette lighter.
1) Try plugging a charger that has a on light in the cigarette lighter and see if the lights go out the same time as the cigarette lighter plug turns off.
2) I assume the high beams activate with the power off, I have a Canadian car so it’s different with the DRL’s but in that case you might be powering the stalk for high beams from an auxiliary supply. I’m guessing when the aux supply turns on (like the 12v cigarette lighter) the headlights come on. If so at best it’s the stalk at worst it’s the switchpack.
I’ll have to dig out the switchpack schematic and see if there is something obvious.
 
Last edited:

X.l.r.8

Supporting Member
Feb 18, 2018
1,500
933
Toronto/Miami
BE3AD07D-00D1-4399-AD93-52AAEAEB732A.jpeg
 

Steve in SLO

Member
Feb 8, 2020
47
59
San Luis Obispo, CA
Thanks for your reply. The high and low beams- all four bulbs- are on with charging, when the key is turned on with the dash light switch in any position, and with the stalk in both the low and high position. In addition all 4 stay on several minutes after the key is removed and the car is locked. Will chase thru the wiring diagrams (thanks for those) afepter Christmas.
 

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