Have a 97 ford ranger xlt 4x4 and my wipers only work on the normal low or high setting but they only go 1/4 of the way up the windshield b4 they stop then go a little more then stop again i was wondering what can i do to fix them because it is snowing and i need them

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[QUOTE="jgbuffy;1880159"]Have a 97 ford ranger xlt 4x4 and my wipers only work on the normal low or high setting but they only go 1/4 of the way up the windshield b4 they stop then go a little more then stop again i was wondering what can i do to fix them because it is snowing and at times they don 't want to work even on the low or high setting.