The LED light would only use a tiny amount of power to stay lit, much less than any small bulb in the car. You might have a poor battery, or you might have a drain on the battery from something else staying on. Any parts store could test your battery for free. That's where I would start, making sure the battery can hold a full charge.
Is the clock light in a radio display? Maybe an amplifier or something connected with the radio is staying on? If the clock is a separate fixture (and I don't even know if they still put such things on cars lately- a separate clock, I mean), then the clock could be unplugged. I don't think there would be a way to turn the light off.
If you have a known good battery and it is still draining fast, there are YouTube videos and explanations on how to hunt down an unintended draw. Mechanics may refer to it as a "parasitic drain"
but it is really an unintended drain. Your car's computers, and security systems, and radio and clock memory will always require a very small amount of battery power when the car is shut off, but that amount is measured in milli-amps, very small fractions of 1 amp of power. usually less than 100 milliamps which is 0.100 amps, or 0.1 amp- see, much less than one single amp. A small bulb like under the dash may be rated at around 2 amps or up to 5 amps for typically larger bulbs. A small bulb might actually drain the battery over several hours. Headlights , you are talking lots of amps, I'm not certain but say around 20 amps. So you see, your clock light would have to have a bad short in the wiring to actually drain a good battery. The light itself would not. This is just me talking off the top of my head, I'm not an expert on electronics or electrical circuits, but I think the information is accurate.
I had an 01 Impala with this situation. Ended up being the factory stereo amplifier behind the back seat in the roof of the trunk. A quick delete of that amp solved my problem. Just feel it after the car has been off for a while, it should not be warm or hot.
SOURCE: 1999 F-350 Diesel drains batteries FAST.
try this...you can also use a test light instead of a ammeter, but the ammeter is more effective:
http://www.wikihow.com/Find-a-Parasitic-Battery-Drain
SOURCE: 1999 GMC Suburban. no sound from radio
there is a plug at the back of the radio connecting it to the vehicle wiring loom. If you can get at thes plug, either from below or by removing the radio unit, make sure the plug is tight and secure. I can't think that the amp has gone or you would have lost all sound, so this is more than likely the problem.
SOURCE: 1992 pontiac grand prix le interior lights and key buzzer wont go
inside the steering column locate the ignition remove wire to reveal screw to remove ignition that wire is what controls the buzzer and light itthe wire probrally wasnt in place correctly wich caused your problem
SOURCE: How to Replace the Starter in a 1999 Pontiac Grand
starter is located on the engine block down below.
Removal & Installation
To Remove:
Before servicing the vehicle, refer to the precautions in the beginning of this section.
To Install:
Starter removal/installation – 3.1L & 3.4L engines
Starter removal/installation -3.8L engine
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