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Why was the OD switch replaced? Were there any previous issues with the OD? Is the starter cranking the engine over normally or is it struggling?
OK. In that case, I don't see the engine dying as a direct consequence of turning the OD on. What I would suggest at this point is diagnosing the no-start condition first, then moving on to any issues with the OD.
There are basic checks that need to be done in order to diagnose the no-start. Those include checking compression, fuel pressure, fuel injection pulse and ignition spark - compression and spark can be checked by spraying starting fluid down the throttle; if the engine starts and runs for a couple of seconds, then compression and spark are good, which leaves either fuel pressure or injection pulse as the possible culprit. Can you try starting fluid and see what happens?
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