Join Date: Feb 2011
Location: Rhode Island
Thanked 25 Times in 18 Posts
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Did you actually measure the parasitic drain? How many milliAmps? Factory spec is usually lless than 10mA (without your mods, and after all the computers have gone into standby). If is 50 mA or less wirth the mods, measured ~30 minutes after shutdown, I don't think it's the cause of your premature battery deaths.
A lot of bad things can happen during a jumpstart, particularly to the sensitive electronics in modern cars/trucks. If, during the jumpstart, you had your ignition On and/or connected the negative jumper cable directly to your battery negative post rather than to the frame, some of the protections designed into your truck were bypassed.
My first suspicion would be one of the rectifier diodes in the alternator has been damaged. If the parasitic drain is more than 50mA, pull the big (120A, I think) alternator fuse and see if it substantially diminishes. If no, you will have to start pulling other fuses and look for a big change.