Discharging Capacitor Circuit

Hi,

I'm a bit of a newbie so I need assistance please. I have created the following in my car.

The idea is that the lamp will stay lit for a small period of time after the ignition is shut off.

I have 6 x 2.7v 50F Super Capacitors in series and a 1k Resistor in Parallel.

However, as you can see, the output voltage (after the Capacitors) while the ignition is turned on, is only 4.4v rather than just over 12v.



What have I done wrong ? Or what am I missing or how to I change things to get the desired result ?



I was under the impression that the voltage would only dropoff AFTER the power source was turned off.


Please help.



Thanks!



I didn't find the right solution from the Internet.



References:

forum.allaboutcircuits.com/threads/discharging-capacitor-circuit.128517/

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