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I have an Audi A3 Ambition car and have bought it in August, 2017. The seller mentioned he built in a start button, so the car needs contact using the key first, then the motor starts by pressing a button (similar to this).

But after a while, issues with starting the motor began. At first the car didn't start sometimes in the first attempt. Another attempt of starting the motor was successful. Until the day, the car could not be turned on anymore. I brought the car to the service for repairment. They changed the starter which was obviously wrong. But there was a suspicion, that the real cause was custom electronics / electronics modification. The starter turned on again, after two weeks, on a trip to vacation. The suspicion is the electronics as the mechanic said.

The question is: what can cause an random activation of starter during drive so is getting destroyed?

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    This is probably not answerable without knowing exactly what equipment the previous owner installed, and what changes were made to the car's wiring. If this were my car, I'd start by removing the things that were added, and returning the car's electrical system to its stock configuration. – DavidSupportsMonica Dec 24 '17 at 22:23
  • I don't think I could agree more with @David - This is spot on advice. I really don't think this question is answerable, either. – Pᴀᴜʟsᴛᴇʀ2 Dec 25 '17 at 1:56
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if i was a betting man i would bet the previous owner did a less than stellar job of wiring it and now 2 frayed wires are shorting against each other activating the starter. Pull back the dash and fix their mistake

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