Cadillac Repair: Digital Guages not working, fuse box, volt circuit

Question
Hello - My digital gauges for gas level, heater, air-conditioner do not work.  My stereo does not work as well.  The heater or air-conditioner can not be turned on as well.  I recently installed a new stereo and suspect that led to the problem.  I have checked the fuse box and all the fuses are not burned out.  What can it be?

Answer
I see this problem many many many times and the fault is that the radio is installed incorrectly.

You most likely used a test light to find a 12 volt source for your radio.

Unfortunately there are a 12 volt, a 5 volt and a 16 volt circuit going into the original radio and you need to re-install the original radio just to see if everything comes back working correctly and if it does, Use a volt meter to find the 12 volt circuit for your radio.

If the original radio does NOT restore everything back to the original displays and AC/Heat controls we will need to do some test procedures to see what you destroyed.


Let me know.