I thought the dealer had done something do with it but I had it checked out today.Power is there I'm lost
If the dealer checked it our and you are not satisfied, take it back. You have not provided enough information to start on this problem.
SOURCE: Truck dies when head lights are turned on.
Were they checked "under load" or just checked? Sometimes an alternator can function under normal conditions but not when you start adding extra power usage. To "load check" it, hook up your meter and start the engine. Take a reading, which should be in the 13.5-14.2 volt range. Have someone start turning on power users; radio, lights, heater, etc. You should notice a quick flicker on your meter and the charging rater should return to the 13.5 or better. With everything turned on it will drop some from the initial reading but should remain in the 13 volt range. If it doesn't remain in the range then it has a burnt diode in the circuit and will have to be rebuilt. Hope this helps.
Testimonial: "Thank you for your directions."
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