I just purchased a used 2004 Dodge Ram 1500 5.7L Hemi with 108k miles. I "tested" the wipers before purchase and they "Worked". "Worked" mean I turned them on they wiped a few times and I turned them off. It started to rain recently and I need my wipers and have noticed intermittent failure and/or incorrect wiping speeds. Sometimes when they are on ANY setting they wipe super fast. Other times they wipe as expected, though the super fast is by far the prevalent symptom. Today they began stopping mid-wipe and I had to turn them off and on again at the wheel.
I am not a motorhead or person of knowledge when it comes to vehicles and am not sure where to start troubleshooting. I suspect it isn't a fuse as it works most of the time, albeit incorrectly. I was reading here and here and I have both symptoms at times but my vehicle isn't the same (don't know if that matters).
Any ideas of how to troubleshoot the root cause of my wiper malfunctioning?
Warmer temperatures remove the problem.