Last week I tried out the new circuit. It did not work. Today I got some time to work on it again. I bench tested it and found out that the dc-dc converter was spitting out 24V... The only thing I could think of is that it needs a load to bring it down. So, I added a 1.5k resistor across the output of the dc-dc converter and it dropped the output down to 15.8V. Sounded good enough for my purposes, so I tried it out on the car and it worked great. I finally think I have a stable and reliable circuit to kill the alternator! Yay.
Here is the latest circuit diagram.
