OVP Relay Location on a 1984 300TD w123? - Page 2 - PeachParts Mercedes-Benz Forum

joshuajeeper · #16 03-21-2010, 08:45 PM

Unfortunately my car is not back together. In fact it is currently going through a (very long) complete restoration. My project progress can be seen here:
http://www.flickr.com/photos/joshuajeeper/collections/72157623002122199/

It started out with just a blown motor in my daily driver to me deciding to take this opportunity to fix all the "band-aids" that I have been working on to .... well....
It was taking so long until this point because since May of last year I have been commuting 200 miles round trip a day to work (Mercedes dealer in San Rafael, CA), but now I have my own shop up near home. So hopefully I will be able to get more work done on it.

And you are very welcome. I'm glad to have helped.

leathermang · #17 03-21-2010, 08:52 PM

If I woke up some morning with my dash in that condition I would just burn the car ' in situ'... I am too old to start something like that... or more important ...to FINISH IT....

byronnash · #18 03-22-2010, 12:19 PM

Just came in from looking for the OVP Relay again. With the glove box out and kick panel off, I cannot locate the relay. I checked in every cranny of that space and it's not there.

What next to fix my tach? No tach amp, and no OVP Relay? I'm pretty sure this isn't a California model based on some photos I saw of the air intakes.

Thanks for any assistance.

leathermang · #19 03-22-2010, 01:12 PM

You really did not say what was wrong with your tach... did you ?

byronnash · #20 03-22-2010, 01:15 PM

The tach is dead. I was following some troubleshooting steps from another post.

I am going to take another close look at the tach pickup to make sure the magnet is still on there. I finally spotted the magnet that is on the (fly?)wheel.

leathermang · #21 03-22-2010, 02:53 PM

If you can take it apart..
you might just try replacing and electrolytic capacitors and resistors that you can get to..
I don't know if it has a printed circuit board or not...
it may have the overload protection inside it...and might even looked burned....
might be simpler than you imagine to fix it...

::matthew · #22 03-22-2010, 03:06 PM

As has been stated above, I don't think you have an '85 style OVP.

MBeige · #23 03-22-2010, 03:09 PM

I believe only '85 w123's had the extra electrical stuff in the passenger kick panel. Yours is '84 so I would start looking else where.

Are you sure the tach amp was originally not there, or was just removed? Got any photos of the area where it should be?

Quote:

Originally Posted by byronnash

The tach is dead. I was following some troubleshooting steps from another post.

I am going to take another close look at the tach pickup to make sure the magnet is still on there. I finally spotted the magnet that is on the (fly?)wheel.

The tach pick up is on the harmonic balancer in front. It's a gray cord, 0.5cm wide approximately, and runs up to the back of the glow plug relay area where it should plug into the tach sender.

byronnash · #24 03-22-2010, 03:35 PM

This thread has a photo of where the tach amp is on most w123's My car has only the diagnostic plug.
http://www.peachparts.com/shopforum/showthread.php?t=272112&highlight=tach+amp

Do you need to remove a bunch of stuff to take the tach pickup out? I haven't gotten my hands in there to see how much clearance there is.

mark scheuerman · #25 03-23-2010, 08:31 PM

Quote:

Originally Posted by byronnash

I did search the archives quite thoroughly leathermang. I read that thread you linked to but did not see anything referring specifically relating to my problem.

The reason I am looking for an OVP relay is that my car does not have a tach amp. I was instructed to take a look at the OVP relay but I cannot locate it. Is it possible to not have a tach amp and OVP relay on a w123 1984 300TD?

Thanks.

I had the same problem with my 84 Ca. 300D. Tach not working. OVP is under right kickpanel. OVP has a red top. After pulling relay off base you'll see a red 10 amp fuse inside red cap, readially accessible. Hope yours is in the same place.