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Turn signals work fine. Until the headlight switch is pulled on. Then the turn signal indicators in the gauges are lit as are the signals. Not flashing- just on. With the lights on, the signal lever doesn’t activate them or make them flash; remain on. I don’t know how long this has been going on, cause i never drive after dark. I replaced the headlight switch and have had the tilt telescope steering column apart, so theres that. Thank you for consideration. Jim
As a quick check, with the signals on see if the signals are brighter than the running lights or not. In other words, turn lights on and observe their brightness then turn lights off and signal on and observe their brightness. If you find one that is the same brightness for both then check its ground. I would suspect the grounding for the rear tail lights as the most likely cause.
The issue comes from most cases a lack of ground for the bulb. When the ground is missing at the bulb for the park light circuit the power for the taller thin element will seak the least path of resistance through the heavy short thick element for the turn signal through the base of the bulb and back feed through the wiring feeding indicator bulbs in the dash lighting them up. Corroded sockets, bad socket or ground supply wiring is normally at fault.
Had a few minutes today. The bulb intensity seems fine. Pulled a front turn signal harness and bulb and ran a direct ground from the bulb to the chassis. There was no change in intensity. the ground on the driver side is good and securely fastened. I did not locate a separate ground for the passenger side, so this is the side i ran the temporary ground to. I can also say that with the turn signal "on", then activating the headlights, the turn signal continue to flash. during this process the instruments indicators flashed as though the 4 ways were on (they weren't). When i turned the flashing signals off, while the headlights were on, I could not reactivate them until I turned the headlights off.
it is the headlight ground you are missing. i think it goes to the metal piece the rear of the headlights mount to. and it is badly grounded to the rest of the car.
If you have the bulb out, the turn signal is the shorter heavier looking filament and the running light is the longer thinner filament. Check each is on only for the right function.
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Turn signals light when head lights on
