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Truck runs and drives fine when lights are off turning lights on and then it spits sputters won't accelerate
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Hello, I can't make much sense of this, other than to say that something that causes a voltage drop in the vehicle resulting in an engine performance issue could be illustrating weakness in the electrical system - starting with the engine's 12 volt battery, or the charging system with the alternator as the key component here. Testing of the battery would be first - ability to charge fully and handle a load, and then also the charging system's ability to recharge the battery while the vehicle is operating.
Let me ask this could it be a ground problem some where couse alternator is working properly i checked it and done a load test on the battery it tested fine
No, I don't see it being a ground problem on its own. Have you checked the charging system -- voltage and amperage? Under load and at 2,000 RPM of engine speed?