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- there is no “split”, the starter has a direct cable connection to the positive terminal of the battery
- alarm/imo has no influence on the starter, in case of activation only the ignition and fuel pumps are not supplied with current.
Most likely causes of the problem:
- cheap replacement starter (guess how i know)
- body/gearbox ground strap
- battery/body ground strap
- Terminal 50 of the ignition remains off
but when i not have deactivate the alarm so the small light is constant the starter never turns so it has to be "split"
i have same remote on Ferrari 355 but there the starter turns but no start before deactivate alarm
I found the ECU under passenger seat inside closed metal box 993 618 959 00 Steuergerät Wegfahrsperre
so no i will try following all cables an see what i found.
Yes, start searching immediately. Only then read again and understand what I have written.
And if you had written from the beginning that a 993 immobilizer control unit was installed in the 964 turbo, I would have put you straight on the right path. Your welcome.