Priming
My 940 LPT only primes for a few seconds when the ignition is turned on the first time, so that does seem right.
However, if you try to crank it with jump leads, without success as you describe, the voltage level will drop so deep that it might sort of reset the ECU. Not sure what that does for the priming sequence.
Running the electrical system with jump leads is one thing, but powering the starter motor is something else. It will draw a high current and every bit of electrical resistance will suddenly become a major issue. Supermarket quality jump leads is usually not good enough. You will find that when you try to crank all electrical power is suddenly gone.
To reduce the resistance as much as possible, connect the + jump lead to the battery and the - clamp directly to the engine block.
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