Immobiliser warning light flashing.

[andrew]

I have checked the battery power when engine is off, reading was 12.6. I turned the engine on and seen 14.67V with the engine running. I turned everything in the car on electrically and increased the revs to 2000rpm and the reading on the battery was 14.43V. I checked for resitance in the circuits between the alternator and starter and earth straps and all readings were 0V. I was wondering if a starter motor stays engaged would it still be using power, thus taking power away from other components. I noticed that when I couldn’t start the car described in my original post the negatime terminal of the battery was hot, I thought this was a sign of resistance in the circuit. However the car had been sitting for more than 4 hours off. I’m considering taking it to an auto-electrician but I want to eliminate what I can to save on labour charges or potentially replacing the wrong part.