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All these answers are right on track; but one thing mentioned here "17 v" gasp my attention... Once you have check and corrected any bad connections/corrosions at any terminal. Disconnect the battery from the veh and perform a load test to the battery to find if is "STARTING TO GO BAD" then if you have the equipment perform a load test to the alternator while "ENGINE IS ON" while testing the alternator keep an eye on the voltage gage... 17v is way out of normal specs...12.6 is a new battery any other readings are fora used battery. about 13.5 to 14.5 is a "normal charging rate. 16v it is CRITICAL VOLTAGE to too many on board components.... which to me tells me that the regulator is falling... Good luck! And post
Your findings as soon you find the issue....
 
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