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Old 07-04-2016, 09:03 PM
Mighty190's Avatar
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Join Date: Apr 2016
Location: Lafayette Indiana
Posts: 406
w201 ignition wiring issues

We have a 190E that we are using for chump car and the key broke off in the ignition so we decided to go with a toggle and push button. I marked things so I know what colors go to what pins on the tumbler and I've found which one turns on the fuel pump and the one to make it crank but I can't get it to stay running. This car is an '89. Did Mercedes have anti theft systems at that time? What could I possibly be doing wrong that's keeping it from running?

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Old 07-05-2016, 05:37 AM
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Join Date: Jun 2016
Posts: 46
You are just missing the wire that have constant 12v, check the wire diagram and you will see what happens. No anti theft at this car.
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Old 07-05-2016, 08:05 AM
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Join Date: Jan 2012
Posts: 7,534
You need a wiring diagram. It isn't as simple as adding a single switch.

You might have to use a double pole or triple pole sw ti get things going. If you tie everything together in a single pole sw, the car might not shut off due to back feeding.

In general, there is an engine run circuit , accessory circuit < ( sometimes 2 ) , maybe a charging trigger circuit.

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