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Another Friend also thew out an idea.
'Twas great to see you again at the Mother Earth News Fair, Ben.
I've also got plans for a DIY hybrid dual-drive truck, this one being my 1987 F250 with the bulletproof 6.9 liter indirect-injected, naturally-aspirated International diesel; an engine that will run on anything that's thin and greasy! My approach is to use a T19 manual transmission with a Power Take-Off. Putting power in through the PTO would enable electric-only maneuvering (while holding down the clutch pedal). Disengaging the PTO would reduce mechanical drag for highway cruising. Using an HPEV AC20 or AC50 drive would also allow significant regen, and another small benefit of this approach would be to shift in neutral and use the hybrid drive to start the engine faster than the 12V starter (also eliminating the need for one of the two big 12V cranking batteries, and allowing stationary genset duty, as well as engine start/stop in traffic jams (EV only for a bumper-to-bumper crawl).
Sounds like a neat concept too!
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