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Audi ur-quattro RR (20V) Engine Motronic Tests

The switch lead should be at least six feet long - the injector tests are triggered, after the diagnostics have been started, by the throttle switch; but the later tests require the switch to be operated from the engine bay.

3mm male loudspeaker connections are ideal for the ends of the switch and diode leads. Maplins sell "12V" LEDs that already contain a ballast resistor.

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