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  #1  
Old 10-24-2005, 07:27 PM
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1993 300D 2.5l L-5 Tachometer gauge

Periodically, when tooling around at slow speeds, the tachometer will fall down to nothing and simultaneously the ABS light will come on. Seems like the turbocharger is not on...but within seconds the tach will come back on and the turbo will seem to be engaged. During the abs light and the fallen tach, no apparent power loss is noticeable. Is this a gremlin, or an indicator of voltage drop below 10. Any thoughts? Thanks to all..Iceman

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  #2  
Old 10-24-2005, 09:32 PM
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Did you check / clean/replace fuse #5 ?
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  #3  
Old 10-24-2005, 11:59 PM
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Replace your over voltage relay/protector. It is located behind the battery under the black plastic cover. I had exactly the same problem in my '91. It's about 80 bux and you will never have to check the ABS light before you merge into traffic again..
Fred
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  #4  
Old 10-25-2005, 08:27 AM
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Thanks Again

Thanks so much for the help..I'll go to the MB stealership and get me one...thanks again...Iceman
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  #5  
Old 10-25-2005, 09:04 AM
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Look it up in FastLane - "Overload Relay" listed under Body Electrical. $77 Dealer might be a bit more, but you won't have to pay the shipping and will have it right away.
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  #6  
Old 10-25-2005, 12:07 PM
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Could also be a failing flywheel rpm sensor. I believe it's below the starter.

Sixto
87 300SDL
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  #7  
Old 10-25-2005, 01:58 PM
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The OVP has gone thru a couple of upgrades since production. So make sure u r getting the latest.
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  #8  
Old 10-25-2005, 08:55 PM
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Thanks

Thanks

93 300D 2.5L L-5 made its trip from Charlotte, NC to New Smyrna Beach today...will begin the replacement of the relay tomorrow...I am changing the oil using the topsider and have a fresh fuel filter, in-line filter, oil filter, new air cleaner OEM, and a fresh can of lubri-moly ready...I have also found that a smoking pipe cleaner fits perfectly in the banjo fitting and it always gives up a smidgen of soot. She is washed and waxed and I just bought 4 replacement wheels from pro-player and they are beautiful...will install them within a week...Good to be back and chatting with the dieselers...

PS Fuel Prices varied on trip

North Carolina $3.19
South Carolina $2.99
Georgia $2.88
Florida $3.29

How in the heck can this stuff vary so much?

Last edited by iceman3876; 10-26-2005 at 01:29 AM.
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  #9  
Old 10-26-2005, 11:05 AM
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Diesel Beagle

Beagle...How did you know they had upgrades on this part? You were right! The old part was 201 540 3845, the new part number 201 540 3745 for the 93 300D 2.5L. However, the price from the stealership is $118 before taxes. Thanks...and if you have any idea where to get this part and save some money drop me a line.

Iceman
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  #10  
Old 10-26-2005, 11:38 AM
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I have seen then for about $99 at a local dealership. They r expensive. I have yet to replace one.
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  #11  
Old 10-26-2005, 01:15 PM
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Beagle

I'm on my way to the Daytona Beach Mercedes Benz stealership...and yes I a gonna cough the $118 up to my buddies there...and I have a friend there that is a mechanic and has been for 27 years...He told me he has some old mechanic books on the 93 300D...so whatever he gives me...I'll tell you...and if its worth anything I'll copy and send to you as well...Iceman
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  #12  
Old 10-26-2005, 04:14 PM
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Go the OVR

Just got back from MB stealership with my new Overload Voltage Relay...and while I was paying...I thought of a good one....they sell OEM parts using the whole man concept..that is bend over and let me see your hole man...Oh well..I took it like a man..or something...Will put it on this evening...Ouch

Iceman
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  #13  
Old 10-27-2005, 04:20 AM
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Csx

Thanks CSX...I replaced it with the OEM ovp and you called it perfect...it solved the problem...Thanks so much...Iceman

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