My Tacoma won't turn all the way over.
It sounds like your Tacoma may have a low battery, a failing battery cable, or a bad starter. If the engine will only crank partially over then there is either not enough power getting to the starter or the starter cannot do it. In some cases this can also be caused by a failing engine. A mechanic would typically attempt to crank the engine over by hand with a wrench to see if the engine will move. If it does then the engine should be fine. If not then it has seized. If it is fine then the voltage at the battery and at the starter need to be tested. This would help to determine where the problem is. I would recommend getting some help with these tests from a certified mechanic, like one from YourMechanic.
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