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Be cautious charging with the trucks alternator. That's been known to kill them. Since yours were already charged enough to start the truck you'll probably be ok.
Walmart has a decent little battery charger for less than $100. You can clip it to the battery posts with the batteries still mounted in the truck and charge them singly.
Walmart has a decent little battery charger for less than $100. You can clip it to the battery posts with the batteries still mounted in the truck and charge them singly.
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