You are here:
- Home
- Shopping
- Vintage Cars
- Cadillac Repair
- 1991 seville
Cadillac Repair/1991 seville
Advertisement
Question
how come my rear turn signals work fine until i turn on my headlights then my passenger side rear turn signal stops working. all others are fine
Hello,
Three thoughts come to mind. One could be a bad flasher. Yes, this could affect just one signal with the lights on. 2 could be a bad ground at the right rear bulb circuit and 3 could be a defective bulb.
The 1157 which is the most common number bulb used with other variations like the 2057 has two filiments. One for the tail lights and when the two filiments work together for much brighter light would be for your brake light, turn signals and emergency flashers.
I will give you a first hand example of what can change just by changing a bulb. I put a l.e.d. bulb in my rear lights on my truck. When I turn the signal on flashes very fast. If a trailer is hooked up with the wiring, flashes normal. One l.e.d. burned out on the right side and I replaced the bulb with a factory bulb. Now, the right side flashes normal and the left side very fast.
I could have corrected the flashing by replacing the flasher with a heavy duty flasher, but never bothered.
I only gave that example to illustrate the answer to your question.
My first thought to your problem though would to change the flasher which is located under the driver's side of the dash.
Good Luck!
Rob
Related Articles
Rob Painter
Expertise
Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?
Experience
Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.
©2012 About.com, a part of The New York Times Company. All rights reserved.