Probably should have tried through the house batteries and waited a little while rather than disconnecting the air ducts.
However, with JEGS jumper terminals now fitted, any future chassis battery jumps should be easy. Can actually connect jumper clamps with engine cover up ... but it's just a few seconds to drop the cover. Will be putting some liquid tape on the exposed brass nuts below the terminals ... the top jumper terminals have plastic covers on them.
Maybe wasted some time, we'll see.
https://www.jegs.com/i/JEGS/555/10314K/10002/-1
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