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If the voltage Comes back ok, i would then advise checking the earth connection on the cluster. Using a multimeter go accross the good live and earth connection and check the voltage, comparing against battery voltage. If the voltage is lower you have a bad earth connection
It wont be a battery issue, I just reccomend you check the battery voltage before checking any other voltage supplys on the vehicle. I would advise you check the connecting plug that is on the cluster for any water infiltration also.
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