Deductions & credits

I think I'm encountering a similar issue. I expected to receive a $7500 tax credit for an electric vehicle purchase, but my total tax liability decreased by only $2900. When I remove the electric vehicle form from TurboTax, the credit for prior year AMT reappears. I gather from the original question that you can claim only one of these credits (correct?). And that I will be able to apply the credit for prior-year AMT to next year's return?