Hi,

The tachometer in our 95 E300D is dead and the ABS light is "on" on the dash.

I checked the main fueses #5 fuse for tachometer, fuse is fine. I could not locate the ABS fuse to check it.

Any idea what this problems might be ?


Thank you guys.

Lookin at search results... I am suspecting the OVP relay??

I hear it is about 100 bucks and it is located behind the fuse panel?

That is the starting point, but first check the FUSE in the overvoltage relay!

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Helo MBDOC,

I read countless posts about the ovp.,

Just 5 min ago, I checked the 10A fuse it was blown. However after replacing it with a new one and starting the car, the fuse melted again.

What do you think is the next step? The overvoltage relay is blowing the fuse. It is the factory one with black top and a clear glass cover over the fuse.

I am thinking that the overload relay is busted indeed? There may be a short in the overload realy itself?

What are your though on this?

thanks again, all of you are of great help

The purpose of the Over Voltage Protection relay is to 'blow' the fuse to interrupt power to, and thus protect, electronics when the supply voltage is too high.

Buy or borrow a multimeter and measure the voltage at the battery with the car off, and then with it running. Anything much higher than 13-14 volts when it is running is not good.

Yeah, that would make sense. Why would the overload relay blow its own fuse

Hi,

i just wanted to confirm the part # for overload relay:

Is the part # for the overload relay

201 540 3745


Also , it seems most 190E and some W124s have the same part no.

I may take out the overload from my uncles 190E to see if its same, if so Ill put it in my E300 and test to see if my relay is

Update:

I just intstalled new overvoltage relay. Everything was perfect for the first 1.5 mins or so.

After the tach went dead again and the car started running at lower idle speed.

WTF is going on.

My best guess right now is that this has something to do with the glow plugs and the glow plug system . It seems like after the glow time was over the car started running like crap again.

One thing to note is that at least the ABS light is off and ABS does work.

Damn it Im slightly pissed off