Question about Cadillac DeVille
The dash lights are controlled by the headlight switch (depending on year) and a seperate fuse, if the lights on radio and heater control work it is probably not fuse but a dash relay or switch. If you have a library card you can log on to the harford county library ( I am sure most librarys have the same service) and go to the reference section pick out your year and model then select the electrical section or my even be a dashboard section. I have used this service many times and it has come in very helpful. Every year and model are a little different so a wiring schematic may come in very handy, which they also have. The hearter sounds like a control problem, electrical problems on Caddys are very difficult they have so many computers and relays almost impossible to fix them without seeing the car. good luck try to find a wiring schematic to see how the lights are Powered, go from there, ground etc. sorry can't be of more help hope i guided you somewhat.
Posted on Sep 04, 2009
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Posted on Jan 02, 2017
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