Lights don't work on instrument cluster 1993 buick regal

It could be , but then again GM had instrument cluster problems back then . Bad stepper motors that controlled the gauges .An lighting problems as well . Go to a auto salvage yard an get a used one for $15.00 an see if it works .

At this point...replace the entire dash cluster. Either that...or the wiring from the fuse to the dash are gonzo or has a short.

In the 99 Regal, the headlamp switch is also the dimmer switch for the instrument cluster.
With the headlights on, try rotating the switch to bring up the "nighttime" intensity.
If the headlight switch has a pre-set dimming function for the instrument cluster lighting (in other words, not adjustible by rotating the knob), then
replacement of the headlight switch would be the only way to fix the instrument cluster lighting problem.
See Wiring Schematic below.
Fig.1 - 99 Regal Headlamp switc & Instrument Cluster Lighting

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there is a video on www.fixya.com/cars/t3649175-dash-lights-out that I used to fix my 2002 buick regal I just followed the video directions

very common problem..not just on the buicks

search "instrument cluster repair" on ebay
search "buick instrument cluster repair" on youtube to repair yourself.

it is a few resistors that need to be replaced/ resoldered.

there are resistors that need to be changed / resoldered.

search youtube..

i found it once when searching buick instrument cluster repair..

btw..if your odometer lights are out.or dim .its the same fix for the instrument cluster

good luck

GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996 Headlight Switch - REMOVAL & INSTALLATION

Except With Head Up Display (HUD)
(see Figures 1, 2, 3 and 4)



Fig. 1: Headlight switch location and mounting-1988 Regal shown



Fig. 2: The headlight switch is secured with clips and screws-1990 Lumina shown



Fig. 3: Light switch location and attachment-1993 Cutlass Supreme



Fig. 4: Headlight switch assembly-1996 vehicle shown

1. Disconnect the negative battery cable.
2. Remove the instrument cluster trim plate by unfastening the retaining screws or simply unsnapping it.
3. If necessary, remove the air outlet trim plate. If may be secured with screws/bolts or clips.
4. If accessible at this time, detach the switch electrical connector.
5. Remove the switch, using one of the following procedures:
   1. Unfasten the retaining bolts/screws from the switch, then remove the switch from the instrument panel.
   2. Unsnap the headlight switch from the instrument panel.
   
   
6. If not already done, detach the electrical connector from the switch at this time.
   

To install:

1. Attach the switch electrical connector and fasten the switch to the instrument panel. If the switch is secured with screws, tighten to 18 inch lbs. (2 Nm).
2. Install the air outlet and cluster trim plates.
3. Connect the negative battery cable.

With Head Up Display (HUD)
(see Figure 5)



Fig. 5: The HUD incorporates the headlight, fog lamp and HUD switches

1. Disconnect the negative battery cable.
2. Remove the steering column opening filler panel.
3. Remove the instrument cluster, as outlined earlier in this section.
4. Depress the locking tabs, then pull the switch out.
5. Detach the HUD electrical connectors.

To install:

1. Attach the switch electrical connectors.
2. Snap the switch securely into the instrument panel.
3. Install the instrument cluster.
4. Install the steering column opening filler panel.
5. Connect the negative battery cable.

Hope this help (remember comment and rates this).

Check the engine to body ground at back of engine on top. It is bolted to the engine and screwed into the firewall.

What you call an instrument panel is called a cluster by some people. There will be a fuse in your fuse box for instruments ( or dash ). Another possibility is that there is a dimmer switch on your dash that is turned down all the way.
I have read online that these switches are prone to failure also.

I haven't owned or worked on a Regal of that year, the newest one I've worked on was an '88. Best bet would be to pick up a service manual, and it should tell you how to tear apart your instrument cluster, and get to the lamps to replace them.