mistaken1
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As my follow up. I installed a new rear battery and the truck fired right up.
While installing the new rear battery I temporarily connected the all battery terminals except the back battery positive (recreated the conditions when the OP drew an arc to the firewall). From that back battery positive terminal (wire) I read 12.x volts to the chassis. The back battery post to the chassis is 25.x volts but that disconnected back battery positive wire is still 'hot' with 12V.
Remember, when doing electrical work on your CUCVs always disconnect the front battery negative first and reconnect it last.
While installing the new rear battery I temporarily connected the all battery terminals except the back battery positive (recreated the conditions when the OP drew an arc to the firewall). From that back battery positive terminal (wire) I read 12.x volts to the chassis. The back battery post to the chassis is 25.x volts but that disconnected back battery positive wire is still 'hot' with 12V.
Remember, when doing electrical work on your CUCVs always disconnect the front battery negative first and reconnect it last.