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  #1  
Old 04-24-2015, 05:11 PM
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What can cause no crank on 87 300d. Stuck now with no schematic

Doesn't seem to be neutral/park switch. Have tried jiggling shifter while turning key. I don't have a meter with me to check voltage to the starter.


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  #2  
Old 04-24-2015, 05:59 PM
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Many things... nss, ignition switch, solenoid, battery, fuse, cables, etc...

Do the headlights come on? Do they dim when trying to start?
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  #3  
Old 04-25-2015, 09:37 AM
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Do you have the junction block on the passenger fender like the earlier 126? I've used it to bump engine for valve adjustment. It may bypass switches.
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  #4  
Old 04-25-2015, 11:48 AM
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I got the car home last evening and just had a few minutes to troubleshoot. I had no 12v at the starter control circuit pin. So I moved to the x42-2 connector to the right of the steering column under the dash. When I hit the start position of the switch there was no power at pin 3. I assume this tells me the switch has gone bad. Been a whole lot of starting of this car during repair so it kind of makes sense.

My question now is do I need any special tools to get the old switch out of the dash or is it pretty straightforward? Anybody had to change one of them?
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  #5  
Old 04-26-2015, 12:28 AM
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The car... YEAR and model just might help us help you.
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Old 04-26-2015, 12:49 AM
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Quote:
Originally Posted by TnBob View Post
The car... YEAR and model just might help us help you.
... The title of the thread says it all...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #7  
Old 04-26-2015, 12:49 AM
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Quote:
Originally Posted by TnBob View Post
The car... YEAR and model just might help us help you.
It is in the thread title. 1987 300d.
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  #8  
Old 04-26-2015, 12:50 AM
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Ha ha, I was milliseconds too slow.
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  #9  
Old 04-28-2015, 09:40 AM
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Can't open the 126 FSM on this to check about the ness bypass, but here's a pic of the terminal block to jump the starter:

May or may not help.
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What can cause no crank on 87 300d.  Stuck now with no schematic-screen-shot-2015-04-28-8.48.04-am.jpg  
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  #10  
Old 04-28-2015, 08:30 PM
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For those not familiar with the numbering convention:
30 = unswitched 12 V dc
50 = starter solenoid control lead
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  #11  
Old 04-30-2015, 08:00 PM
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. Those small pieces are bad news aren't they. I don't think my problem is the switch.


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  #12  
Old 04-30-2015, 08:01 PM
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Are they part of the tumbler? They were in the back side of the switch.


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  #13  
Old 04-30-2015, 08:12 PM
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Or is that part of the housing? Does the tumbler directly engage the switch or does the housing?
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  #14  
Old 05-01-2015, 01:24 AM
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Quote:
Originally Posted by nEERcrazy View Post
Or is that part of the housing? Does the tumbler directly engage the switch or does the housing?

You've probably got to look at the other parts to see exactly where they may have broken off of.

If you use a screwdriver does the electrical switch move correctly when you turn it? A couple detents and then the momentary spring return for the starter

You can plug the electrical switch back onto the connector plug and then use a flat blade screwdriver to turn that center part. If the car starts you know the switch is not part of the problem.

there is mechanism between the key cylinder and the electrical switch so those pieces could be from something in that part of the entire locking mechanism.

The procedure is to use the key turned to position #1 then the ignition switch connector can be removed or installed without breaking anything.
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  #15  
Old 05-01-2015, 03:17 AM
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1987 Mercedes-Benz 300D Base Sedan - Ignition - Page 1
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