What would cause my headlights to go dim then back regular? Plus my dash lights go dim too. Battery light is on but no codes come up on the computer when we check it.

If the dashboard mileage light on your 2001 Buick Regal LS is very dim and the Service Vehicle Soon (SVS) light and antilock light stay on, there could be a few potential causes for this issue. Here are some things you can check:

1. Dim dashboard light: If the dashboard mileage light is very dim, it could be due to a burnt-out bulb or a problem with the dimmer switch. Try turning up the brightness using the dimmer switch, and if that doesn't work, check the bulb and replace it if necessary.
2. SVS light and antilock light: The SVS light and antilock light staying on could indicate a problem with the car's computer system or with the antilock brake system. It could be caused by a faulty sensor, a wiring issue, or a problem with the computer itself. It's recommended to have the car's computer system scanned for error codes to determine the root cause of the issue.
3. Battery or charging system: A weak battery or faulty alternator can cause electrical issues in the car, which could be related to the dim dashboard light and the warning lights staying on. Have the battery and charging system checked to rule out this possibility.

Check battery and fuses.

Help! Dashboard lights turn off when I turn on headlights at night ...

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SOLVED: Headlights cause dash lights to turn off - LS1TECH

ls1tech.com/.../1432752-solved-headlights-cause-dash-lights-turn-off.ht...

Jun 9, 2011 - 2000 TA convertible: The problem started a few days ago, when I turn on my headlights, the dash lights and the radio display slowly dim to ...

Dash lights turn off when headlights turn on. **SOLVED** - Honda ...

www.civicforums.com > ... > 6th Generation Civic > ICE & Electrical

Jul 15, 2014 - OK, just picked up a 2000 DX hatch, automatic. Stock interior everything except previous owner changed gear selector stick with an aftermarket .

Yes this can be a normal condition caused by load being applied to the headlights and that lowers the voltage, the lites dim, then the load is removed and the lights brighten. Typical loads that cause this are AC climate control related. Have the Alternator load tested to confirm there is no problem in the charging system. Also have the battery tested, a battery that is starting to fail can cause this problem as well, a failing battery takes a huge amount of charging system power to keep it up, so that makes the lighting see higher spikes in voltage

it sounds like you have a bad connection on the left headlight either the earth or the power wire,check the connector on the headlight bulb plus all the other wiring & connector plugs.....hope this helps.....cheers.

You Digital dash is working as it should, it is supposed to dim with the lights on so your eyes don't have to adjust, from looking ahead to checking speed and back

try to reset the battery the computer which controls the alternators output might be confused. To reset the computer disconnect your battery for around 35 minutes and then hook it back up. This should solve your problem.

I just had found the solution to my dash light problem. The ground between the battery neg pole and the car frame was bad (broken battery holder) That ground signal also goes to the motor (that connexion was good) but the connection between the frame of the car and the neg pole of the battery was intermittent.

check the battery connection it might be corroded or loose also your might check your alternator this mostly causing battery discharge

It's the dimmer switch in the column.