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1974 450 SL
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Discussion Starter #1
I have a 74 450 SL that has starter interlock issues and I found a new looking magic box with no labels or numbers stuck to the firewall above the passenger footwell that I cannot figure out. It doesn't click or seem to do anything when I try to start the car. It is about 2" x 12" x 8" and has a wiring plug going into the top which I cannot get to to see if it is Benz equipment or where the wires go. I think they go thru the firewall. There are 3 additional sections screwed to the bottom, left and right sides which have cooling-like fins on the protruding sides. It also has a plastic adjustment knob for something that wratchets and is about the size of a dime in diameter and only turns 3/4 and hits a stop. A friend said it could be an alarm and might be part of my starter interlock problem.

Ideas?

Scott
 

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Leave it alone !![}:)]It contains nuclear fisionable material which will contaminate the world[xx(]
just kidding[:D],that is the single most important thing in your car,besides the ignition keys,It's .....the injection computer!
And you have now altered the idle mixture control by screwing the mixture control knob.[:0]
You will have to get it to a merc specialist to have the mixture control bought back to stock specs,otherwise the car will run like a sack full of assholes,really ugly![xx(][xx(]
See my email reply to you concerning the lockout switch and goodluck.[:D][:)][:D][8D]
 

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1974 450 SL
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55 Posts
Discussion Starter #3
Well, this isn't the first time I've found key components to something and then fouled them up before I got smart..... and didn't mess with them. Now why don't they just put a sign on it saying if you screw with this your kar might not run right? [:0]

A friend on mine with an 81 W107 sez that on the 1974, there are 2 relays that cause the ignition to lock out the starter. 1 for the seatbelt and 1 for the seat pressure. And that I might be able to jump them. Do they have the same color coded wires as the harness under the seat or the seatbelt buzzer relay? And where might I be able to find this nasty little box? Or can I just jump them at the harness plug? Something tells me I already tried that, though.[V]

Thanks,
Scott
 

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Must be a really early USA thing because i have never seen ignition or seat belt lockouts on the Euro mercs we have here ,on those built before the eighties.The only lockout devicxe should be the nuetral safety switch on the ttrans.
What have you been playing with ?[}:)]
 

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1974 450 SL
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55 Posts
Discussion Starter #5
Well, my friend just emailed me that he checked his maunal and yes there aren't any relays...

I still think there a simple way to bypass/jump the seat lockouts. Like leave on open and the other closed or something. I tried what I thought was all of the possible combos, but it still won't kick.

Gotta get back to class (i teach.)

S
 
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