Replace your battery. If that doesn't work it could be a burnt out starter solenoid. My car began giving me starting problems this winter, but once i replaced the battery (and primed my fuel system) I've had no more problems.

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1963 Ford F100 - Cummins Swap?
1985 Mercedes 300SD - 210K
1992 Ford Festiva - 92K
2001 Ninja 250 - 8K