My regular headlights stopped working, high beams still work, but intermittently. I checked all the bulb plugs, and replaced the headlight relay, still no low beams. Is there another relay?

Check fuses first!

Solution: If both headlights aren't working, it's unlikely that a bulb is at fault. The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. ... Consult your owner's manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.
OR
Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working. High beam headlights don't work or low beams don't work. The cause: A burned out bulb, or a problem with the high beam switch or relay.
https://www.lifewire.com/fix-non-working-headlights-4137021

https://www.thetruckersreport.com/truckingindustryforum/threads/high-beams-not-working.83644/

Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working. High beam headlights don't work or low beams don't work. The cause: A burned out bulb, or a problem with the high beam switch or relay.Dec 1, 2019
https://www.lifewire.com/fix-non-working-headlights-4137021

Bulbs usually don't burn out together, but it's still important to rule that out by checking for power. Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working. High beam headlights don't work or low beams don't work.

I have seen both low beam bulbs burn out at the same time.
Its possible the relays have burnt out for the low beams.

First it is possible that both low beam filaments in bulb are burnt. Check fuses for low beam before replacing the bulbs.

if the fuses are good then you need to check for power and ground at the headlight plug that attaches to the headlight bulb if you have a good power and ground there and the connections are good then the bulbs are both no good.or if you can tell the bulbs are burnt out by looking at them then you don`t have to check powers and grounds.you also can directly feed power and ground to the bulb and check both the terminals for high beam and low beam as you cannot tell which is which by looking at the terminals

Yes your daytime running light just uses the headlight bulb on a lower voltage so if the headlight is not working the drl will not work as well, they are dirrectly related,,check the head light fuse,and check to make sure the bulb is good,,

At first 1994 C280 high beams began to not connect regularly when stick pushed forward, then not at all. Drove high beams by pulling and holding stick back towards steering wheel until that stopped working, too. Shop said the turn signal switch was at fault-- had seen it many times before with W202; about $160 to replace. Haven't done it yet, but should be an easy fix?

Strange headlamp problems on Saabs can often be attributed to a failing Headlamp relay. Here are a few common situations:
Issue1 - Headlamp switch will work backwards: Turn on the switch and theheadlights go off and turn off the switch and the headlights will goon.
Issue 2 - High beams will disappear. You will have nohighbeams. Be sure to check the headlight bulbs PRIOR to ordering therelay. Remember however that it is possible for both high beams burn out at the same time
Issue3 - High beams will not work only the low beams will.
Issue 4 - A single bulb setting (low or high) on either side will not work and bulb replacement will fix it.
You can sometimesfix these issues by removing the relay, taking off the cover andresoldering the connections on the relay bottom. To perform this repair, go to my illustrated tutorial at customsaab.com.
In some cases youwill have to replace the relay to effect a long term cure. The aftermarket replacement can be had at Eeuroparts.com for about $60.00:
Name: Bulb Check Relay
Part Code: 4109070A
Brand:
Description: Bulb check relay for any 9000 92-98, 900 94-98, 9-3 99-03, 9-5 all.

KAE (Kaehler) made in Germany.
Price: $59.90