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Northeast Indiana | Try buying a cigarette lighter plug in readout fir how many volts your system is running at, and see if the voltage drops the same time the "!" shows up. This can help determine if you're losing charge at the alternator or somewhere else. If so, from there unfortunately it will be a case of chasing wires and connections looking for the issue.
https://www.amazon.com/Charger-Adapter-Cigarette-Delivery-Compatible...
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