Can bus resistance checking can be tricky, all depends from how many nodes you got on lines.
Double check can bus lines make sure you got low resistance cables fitted when extended can bus lines, if they got high resistance that can cause you a fault by terminating can network with over 120 ohms
Dont remember if brown cables was gnd in astra but i think they wad positive but wait till someone confirms it or when i check on wirings but anyway 8v sounds much too low
Bad solder or crimping can cause it
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