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actually turned out to be neither...My main battery fuse (which the opus sources power through) was acting VERY strange. On visual inspection, it was not blown, but anytime any significant amount of current was trying to flow through it, it would act as an open circuit. When the current level dropped, it would be almost like a closed circuit (lke a good fuse should be). Switching on the carPC made it go open circuit....I've never seen a device act in such a non-Ohmic way like this before - made it very hard to diagnose the problem. Must have had a dry/weak solder joint between the fuse wire and the end cap that made it impossible to see it was blown.
The solution was easy though - just replace the fuse!
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