I have seen where if the car stalls it will turn on that light, but not set a code. I am not sure if pulling codes will help or not.
If your battery was dead, that may have something to do with it. Do you have the option on that charger to boost a car also?? I know mine has the 2 amp trickle charge, 10 amp regular charge and a 50 amp engine start. You may have to give it a good charge, then also try boosting it.
It is possible that moisture still did get into the system.
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