Question about 1984 Mercedes-Benz Mercedes Benz 300 Class

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Wheres the volatge regulater

I would like to know where the voltage regulater is on a 1984 mercedes 300 td?

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Its located on the alternator and is very easy to replace. you get at it from under the car. 2 screws hold it in place. if your car is not charging this is probably the problem.

Posted on Aug 07, 2008

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Posted on Jan 02, 2017

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Where can I find a video on installing front wheel bearings on a 1984 Mercedes 500SEC


You're in for a job here but if you're up for it... here is a page that seems to follow the approach I would use.
http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1590160-front-wheel-bearing-removal.html
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Where are the fuses on a 1984 300 td


for the 300D It is in the engine compartment of the car. After opening the hood, look in the back drivers side corner, right beside the spring to the hood. Their is a black compartment with two knobs. Unscrew the knobs and the cover comes off, there's fuses. The back of the black cover usually can tell you what each fuse is for

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Free download repair manual 1984 mercedes-benz 300 TD Turbo


the engine does not stop, the roof trap does not open,the windows neither,the flashers do not work,the locks of the doors work manually and one by one,the battery red light on the board is constantly on.So the question is:what's wrong ?

Feb 15, 2011 | 1984 Mercedes-Benz Mercedes Benz 300 Class

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Where is the fuel relay for the punps


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Jan 11, 2011 | 1984 Mercedes-Benz Mercedes Benz 300 Class

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1984 Mercedes-Benz 300 SD My brother was messing around with our 1984 Mercedes-Benz 300 SD and seemed to blow something. Windows, wipers, sunroof, etc.. all not working any more. We replaced the fuses...


If you are certain that the fuse is okay, next replace the Multi-Purpose Relay/Combination Relay. This relay controls all three of those devices and is most likely your culprit. I would try the junkyard first and grab two just to be on the safeside. You'll find it under the fuse box cover on the driver's side engine bay.

Dec 08, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class

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I have 1984 Mercedes benz TD .Recently i cann't start the car key doesn't turn in ignition lock houseing


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Sep 15, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class

2 Answers

1984 mercedes 300 diesel has no electrical power when running


Old Diesels do not require electricity once started so luckily the problem wont stop you once you're up and running, though if at night you wont have headlights, brake lights, hazzards or turnsignals.

Even if it was a dead battery, your alternator would still give you power once started.

I'll need more information to help diagnose better. First, once started, do you have electricity? Or is it dead all the time?

Alternators need the engine to spin them, so first make sure there is a belt attached to the alternator...open hood, look bottom left of engine for alternator...look to see if there is a black rubber belt attached to the pulley on front of alternator.

Then make sure wire cluster plug is plugged in securely to top of back of alternator. If so, follow the wires up to battery and see if they are torn, detached, worn or corroded.

You will need to a good new battery and to pick up a cheap voltage tester from Radio Shack or similar place. Check battery power, set voltage tester to 12V and with engine off voltage should be around 11-12V...once engine is started, it should be showing 13 to 14 volts.

There are lots of "bad" ways to check to see if alternator works, but they can damage the alternator's internal voltage regulator...so I warn you not to detach from battery while running.

If new battery is installed, connectors and all wires connected tightly, and still no power once engine is started...or you see voltage slowly dropping while engine is running...and turn on headlights...see if it still goes down lower...reach over top of engine with a friend holding tester leads to battery terminals, you can rev the engine...there is a metal bracket at top center of motor that will have a red sticker that says, "engine stop" pull it away from engine to rev, push to shut off engine...this a fuel control gadget. If you rev the engine and there is no change in voltage...and all wires are intact from alternator...then your alternator is not working properly and will need replaced.

I stress this, before you decide this is the prroblem (which is expensive and time consuming to fix, MAKE SURE ALL WIRES are SECURELY ATTACHED and in PLACE.

Please let me know if this helped you and if not, tell me what you learned and the other clues I need to better diagnose. Thanks and good luck!


Feb 28, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class

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