1990 Mercedes Benz 230te my battery is down

Have it tested to determine if it's just a bad battery or if something is pulling it down.

Did you have it tested or not?

No, it doesn't mean something is wrong. The system has numerous components on timers that activate when the battery is connected, the door is opened or the key is turned on.

You're not hearing what I'm saying. Timers are triggered when the battery is connected and they have to expire before any measurement can be taken.

Here is the procedure to test for draw.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 20 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.