Rick Spivey

New forum member, question for the seasoned veterans. I am only a shade tree mechanic, looking to see if someone knows the quick answer before I have to run some tests. My wipers don't park correctly, they stop wherever you turn the switch off. Also the intermittent wiper option no longer works at all. 1990 Comanche eliminator model, tilt column. Is my problem at the switch, or at the wiper motor? I Don't like to just throw new parts at an issue, wondering if anyone will recognize my symptoms and be able to pinpoint the broken component. Thanks!