Ignition switch bypass w115 300D - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 07-16-2015, 04:41 PM Thread Starter
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Date registered: Oct 2012
Vehicle: 1972 220 D, 1974 450SL, 1995 E300D 2002 S430, 1976 300D
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Ignition switch bypass w115 300D

I have been removing unneeded items from my 76 300D to get it ready to run in the 24 Hours of LeMons. The power window wires seem to have a pigtail that runs to a relay that controls the ignition.

I need an emergency cut off switch to race. The PO boogered up the glow relay wires and now it has a gorilla knob deal. I would like to just have a switch panel so I can power on, glow, and start that way, along with kill switch.

does anybody know how to remove wires from the ignition, map them and help me engineer that?

Clay

74 450SL - Froggy
'02 s320 - Victor
'76 300D - Voldemort
'95 E300D - Cleo
'72 220D - Gump
'87 300SDL - POS SDL

92 300SE - #1 boys ride
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post #2 of 3 (permalink) Old 07-16-2015, 05:42 PM
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Date registered: Oct 2010
Vehicle: 1975 300D W115
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The engine is shutdown by vacuum when you turn the key off. If that was to fail, there is a tab you push down on in the engine compartment (it should have a red "stop" sticker on the tab). I guess you could find the brown vacuum line that runs to the ignition switch and attach a manual vacuum pump to it (like a brake bleeder type pump). You could a run a linkage to the push down tab and try to run it to the cabin. I think the best may be to install an emergency shutoff between the air filter and intake manifold to cut off the air supply. You could either use a solenoid or a linkage of some sort. We have the air shutoffs on our diesel fire trucks and they shut down the engine very fast. The ones on the trucks are mechanical and have to be reset manually. I can take a picture of it if you need it.
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post #3 of 3 (permalink) Old 07-26-2015, 08:48 PM Thread Starter
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Date registered: Oct 2012
Vehicle: 1972 220 D, 1974 450SL, 1995 E300D 2002 S430, 1976 300D
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IF it is vacuum actuated, then I would need an electric vac producer to enable it to be switch actuated, as I do not think I would be able to access the under hood emergency shut off valve at speed. Maybe the fire engine too hickey is what I need

Clay

74 450SL - Froggy
'02 s320 - Victor
'76 300D - Voldemort
'95 E300D - Cleo
'72 220D - Gump
'87 300SDL - POS SDL

92 300SE - #1 boys ride
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