Had a similar situation (but not Jaycar): unit was powered from 'accessories' so started OK with key on waiting for glow plugs to heat up, but when I started the vehicle it would power down because 'accessories' is turned off during start. When power was returned by restoring the key to 'on', the unit was still powering down and would not recognise the re-application of power so just stayed off. Completely repeatable, but supplier claimed no-one had ever reported this problem.
Fixed it by running it from 'ignition' rather than 'accessories'.




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