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05 Escalade, High Voltage? Electrical issues/radio won't turn on

12585 Views 12 Replies 7 Participants Last post by  Cameron0588, 
SolidGoldCaddy
Hey guys, hoping this happened to someone else and it's and easy fix/cheap.

So I just started my truck, let it warm up for 10-15 before driving, and then when I got to my destination, put it in park and sat for a minute. The radio/navigation won't turn on. It doesn't display anything. When I hit the power button, the backlight comes on and the time, but it won't power on. Also the drivers and passengers side doors button illumination is being weird. One minute it's fine, the next they flicker off, then back on. The voltmeter is reading higher than what I think is normal, and it's jogging between 15-16 volts. Then just as I was about to leave, the meter dropped down below 14 volts and the idle roughened up a bit. No engine or battery lights, no warning lights of any kind. 86K miles. Runs and operates fine.

Really hoping to shed some light on this issue and find a solution.

Thanks a ton in advance fellas!
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High voltage sounds to me like the voltage regulator, but the rough idle when it drops to 14 volts doesn't make sense to me the vehicle should run just fine. As the above poster suggested, check the battery cable connections at the battery and the other end attachment points for problems.

From what I remember on Escalade, Tahoe, and Yukons the voltage regulator is external to the alternator. I believe it's the black box on the negative cable coming off the battery.

These vehicles should also give some indication in the DIC like, 'service charging system', 'battery not charging', 'charging system failure'. Those I listed come from the 2005 owner's manual. I received the, 'service charging system' message when my alternator started going out intermittently a couple of days before I replaced it.

Good luck, electrical gremlins are the problems I hate the most.
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the cadillac man said:
Wake the voltage regulator is in the PCM which sends a signal to the alternator to charge the battery
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My shop manual lists that black box I referred to as the, 'Generator Battery Control Module', it works with the PCM to act as a voltage regulator. It's more complicated than I thought though. It's on the class II data bus and controls the generator field control circuit according to the shop manual. The complete description is in Vol 2, pg 6-779 if you have the manual.
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