If I jump the starter via the single connector over by the fuse box to +12 it cranks and starts. If I turn the key it does nothing, no dimming lights, no click, nothing. Any suggestions?

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1984 280E

Something's amiss in the ignition. Not sure what though, maybe wiring.

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1990 190E 3.0L

You could first give the starter a tap while someone spins it over. Check all the earth leeds from engine to chassis .And the battery conections them selves.

Is there a relay from the ign switch to the two wires that go into that single connector plug by the fuse box and water line from back of cyl head to firewall? Again it WILL crank and start if I jump that connector to +12...

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1984 280E

93 might have an antitheft that is tied to the remote unlocking. Do you have a wiring diagram for the car?

it was..... *drumroll* the Neutral Safety Switch on the tranny! Fixed. :p

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1984 280E

Lol. It's always the obvious thing that no one ever guesses

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1990 190E 3.0L

Well what a plonker