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Trickle charger is good for maintaining the battery charge (in short the battery must have at least 50% juice).
Battery at 0% juice, you a need fast / smart battery full charger.
In order for you to load test your vehicle, please make sure you have a fully charged battery(done correctly).
If your vehicle starts up, you are half way there. Turn everything on (lights, AC, radio and etc ) ... Increase your RPM... Check the voltage if you are under, within or over the specs. ( some vehicles are known for under or over charging)
You won't get far with a bad alternator. Voltage issue equates to Christmas tree lights in your dashboard ( SES, battery, 4x4, tranny msg, and etc)
Good luck!
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