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  #1  
Old 06-11-2022, 09:04 PM
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Car won't start...W123 300TD

Hi all, it's been ages since I've been around, but I was getting the beast out, and was getting it ready to take to an event, when I plug in the key and turn it to ignition on thinking the glow plug light will come on. But, instead the seatbelt light is flickering, there's a loud buzzing coming from the thing pictured, no glow plug light, and when you turn the key to start position....there's nothing, starter doesn't even engage.

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Car won't start...W123 300TD-pxl_20220611_234604415.jpg  
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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.
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Old 06-11-2022, 09:32 PM
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Sounds like a dead battery.
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Old 06-11-2022, 11:23 PM
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I do keep a battery maintainer on it, and put a booster on it for a few minutes at 55 amps, and it still did the same thing.
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  #4  
Old 06-12-2022, 12:18 AM
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That is the glow plug relay in the picture.

Do the headlamps work with the key in the run position. What do the headlamps do when trying to crank the engine.

How old is the battery? How long ago was it run?
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Old 06-12-2022, 12:00 PM
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The starter won't do anything when you crank the key. The glow plug relay buzzes and it's like shutting off all other ignition or that's what it seems like. It does have symptoms of a weak battery, but even when the 55amp booster was put on it, it was the same way. It has been a while since it was started, about 10 months maybe a year. But, it's always had the trickle charger on it. Also, when the battery charger/booster was on it, it showed the battery was fully charged.
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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

Last edited by crazy4diesel; 06-12-2022 at 01:26 PM.
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Old 06-12-2022, 02:07 PM
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Quote:
Originally Posted by crazy4diesel View Post
The starter won't do anything when you crank the key. The glow plug relay buzzes and it's like shutting off all other ignition or that's what it seems like. It does have symptoms of a weak battery, but even when the 55amp booster was put on it, it was the same way. It has been a while since it was started, about 10 months maybe a year. But, it's always had the trickle charger on it. Also, when the battery charger/booster was on it, it showed the battery was fully charged.
We have a 1965 Mustang parked in our garage, a favour for a friend who lives in NY. It was on a trickle charger for a long time, but everytime he would be in LA, twice a year and pick up the car to drive it the battery would be shot. Using a booster or charging it with cables would not start the car. A fresh battery did.
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Old 06-12-2022, 02:37 PM
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Well, the battery is about 8 years, so...it is probably time for it to go to crap. It is strange the charger indicates it's fully charged.
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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

Last edited by crazy4diesel; 06-13-2022 at 12:38 PM.
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  #8  
Old 06-13-2022, 10:56 AM
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yes.
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  #9  
Old 06-13-2022, 08:17 PM
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You guys are geniuses. New $200 battery, and she fired right up!

Thanks everyone!!!
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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.
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  #10  
Old 06-13-2022, 10:25 PM
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Quality car batteries normally last a maximum of 5 years. After that you are really taking a chance even if using a trickle charger.
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  #11  
Old 06-14-2022, 10:49 AM
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This one was a Mercedes-Benz battery, and you won't believe it but it was 12 years old!

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