Question about 2003 GMC Envoy

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I recently installed a new car radio The back of radio gets very hot not just warm but hot checked wiring.and fusses ?

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It is not unusual for a radio to get very hot. Internal amp is releasing heat

Posted on Jun 27, 2009


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Check all the fuses to see if they have power. I think the fuse your looking for is in the box under the hood by the battery. I recently had the same problem and had to tap into the big blue wire by the in the car fuse box to get the constant hot to the radio.

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Your old radio had at least 2 power wires, some had 3. One of them stays hot all the time for the clock and radio presets, the second is hot when the key is turned on. And the third is hot when your dash lights are on. If you get these mixed up when replacing the radio, you will have this problem. Most of the dash lights on a GM are under the taillight fuse. I would check them all with a test light. Make sure you are not powering your radio from this circuit. You don't want to dim your radio.

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The light that your having a concern with all appear to be part of the headlamp switch dimming circuit. Check the radio wiring again and make sure it was not wired into the the incorrect power wire that had to do with dash light circuit.

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  1. Check the wiring of the new radio installed as follows..
  2. Disconnect battery ground
  3. verify radio ground wire is grounded to metal
  4. verify radio hot wire (normally red and thick) is connected to a power source that is off when the ignition key is in the "off" position.
  5. verify that the always hot wire is connect to a constant 12v power supply even with the ignition off.
  6. make sure the pwr antenna wire if not used is taped at the tip and not touching any metal.
  7. verify that all speaker wires are connect correctly and not shorted to ground.
  8. connect battery ground you may get a small spark if your courtesy lites work.
  9. start engine verify your battery is charging by disconnecting the battery ground cable while the engine is running, it should continue running if it don't, alternator maybe bad.
  10. If it continues running problem solved..

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