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Question
I have a 1992 cadillac sedan deville.The flasher fuse was not working and i replaced it. I inspected all lights. All  are working except the rear turn signals. Front signals work if you manually work turn signal lever. The brake lights and hazards work but no rear turn signal lights not even when manually operating turn signal lever.Any idea what my problem could be?

Answer
Hello,

There are many things that can be wrong here and the only way to perform a proper diagnoses is to cqire a factory service manual from Craig's list or Ebay.
There is no set answer here. I have even seen these cars equipped with a hitch and trailer wiring which could be another factor. There may be multiple fuse boxes in this vehicle and you can confirm this through the owner's manual. You could in fact, still have a bad flasher and this vehicle is either equipped with one flasher for dual purpose or two flashers, one for the four ways and another under the driver's side dash for the turn signals. You could have a ground issue in the rear and even a bad turn signal switch requiring the steering column to be disassembled.
Your description leads me to believe you have a bad t.s. switch flasher, but that is merely a guess and I would recommend the factory manual to diagnose and repair this problem and anything that comes up in the future. This is the best tool you can ever get to repair the vehicle.

Good luck!

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Rob Painter

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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.

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