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Old 06-27-2004, 10:33 PM
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Join Date: Jun 2004
Posts: 6
190D hard starts

I have a 1984 190D with some serious hard morning starting.

Doing some searching on this and another forum, I've heard that a faulty OVP relay or a blown fuse in the glow plug relay could be the cuplrit.

Now the million dollar quesiton is where is the OVP relay on a 190D? I've looked at area behind battery where the Klima relay is. Only 2 relays in that area, the Klima one and a Kickdown relay.

Is it in the fuse box? It appears that there might be a missing relay there.

And the 2nd question is, where is the Glow plug relay? I've looked in the drivers side fender well and only see one fairly large black box, about 4"x5"x2". I can pop the cover on that, but dont see a fuse. I do see what might be some kind of fuseable link beween 2 screw downs, but that sucker is fairly thick and I dont see a 12v system burning that sucker through.

Any help is appreciated.

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Old 06-27-2004, 10:46 PM
compress ignite's Avatar
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
G.P. "fuse"

You have found your G.P. fuse (looks like an aluminum bar)
between the two securing screws.
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Old 06-28-2004, 08:49 PM
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is there a OVP?

Is there a OVP relay on the 1984 190D? If so is it located in the fuse box or behind the battery as on a 190E?
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Old 06-29-2004, 01:27 AM
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Join Date: Oct 2003
Location: USA
Posts: 221
The 1984 190D does not have an OVP relay, only '85 and later 190D's have them. Is the glow plug light coming on? It is possible the 80 amp fuse has a hair line crack or one or more of your glow plugs are bad. With the key on (glow position) is there voltage on either side of the 80 amp fuse?

You can test the plugs by taking of the large connector on the relay and measuring the resistance of the glow plugs at the connector. On a cold engine the plugs should read 0.6 ohms. Any glow plug that reads more than 1 ohm is bad.


2013 Mercedes-Benz C250 Sedan - 110Kmi

Last edited by MB_FanAddict; 06-29-2004 at 01:44 AM.
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