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Cadillac Repair/85 cadillac coupe deville

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Question
The gas and temp gauge are showing a d on the display and Ive checked the fuses and all looks well with those.I'm new to the car I was just lookin for some advice on what it could be.

Answer
Hello,

I believe the best advice I can offer for you is to obtain a factory service manual for the vehicle either through Craigs or Ebay. Not only will you have a diagnostic flow chart to guide you through this problem, but anything else that comes up. Very few service centers and forget about a dealer have any of this information, so when you have to take the vehicle in for diagnostics of whatever problem you run across, they can work off of your manual.
There is no general one size fits all answer for your complaint and it could be a fuse from an additional fuse box, a wiring feed issue, printed circuit issue, just abut anything and that is why you need the manual. Having it will save you lots of money and frustration.

Good luck!

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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.

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