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87 Benz 190e 2.3 start is it the starter or alternator?

It's impossible to say for certain whether the issue is the starter or alternator based solely on the information provided. Here's why:

Starter Issues:

* Common Starter Symptoms: Clicking sound when turning the key, engine doesn't crank, slow cranking, starter engages but doesn't turn the engine.

* Possible Causes: Worn starter motor, bad starter solenoid, faulty battery connection, bad battery.

Alternator Issues:

* Common Alternator Symptoms: Battery light on the dashboard, dimming headlights, electrical components malfunctioning, engine dies after a short period of running.

* Possible Causes: Worn alternator belt, faulty alternator, damaged wiring.

To diagnose the problem:

1. Check the battery: Make sure the battery terminals are clean and tight. Test the battery with a voltmeter to see if it has enough charge.

2. Listen for starter noises: When turning the key, does the starter make a clicking sound? This could indicate a starter solenoid issue.

3. Check the alternator belt: Ensure the belt is tight and not cracked or worn.

4. Look for warning lights: Is the battery light on the dashboard lit? This could indicate an alternator problem.

Recommended Action:

* If the battery is the culprit: Charge the battery or replace it if necessary.

* If the starter is faulty: Have it replaced or repaired by a qualified mechanic.

* If the alternator is failing: Have it replaced or repaired by a qualified mechanic.

Important Note: It's always best to have a qualified mechanic diagnose your car's starting issues. They have the tools and experience to identify the root cause of the problem and recommend the appropriate solution.