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Flickering lights, on a Cadillac STS, is usually a sign of a loose wire. When all of the lights flicker, it is an indication of a loose battery ground cable.
Might be a weak battery
why do my lights flicker and interior lights flicker
Sounds like you need a new battery.
It is possibley your alternator or battery
Your lights may flicker because they power is really low. It is very common for them to flicker when there is a storm out.
turn the key, and if the interior lights don't come on or flicker, then its dead.
This is simple. I call it American manufacturing. No attention to detail, carelessness and sleeping on the job.
Because power from the battery, which was going to the lights, is being utilised to turn the starter motor. You should really start the car before you turn on your lights to avoid putting unnecessary strain on the battery
Probably your battery cable or cables are loose on one end or the other.
A loose battery cable can cause your vehicle to on most stall and it can cause the lights to Flickr. Make sure your battery cables are tight and free of corrosion.
An elf under the hood who's disconnecting and re-connecting the battery terminals!