95 windstar wiper problems on 1995 Ford Windstar

wipers work fine if you are not signaling a left turn or using the high beams on headlamps.

Asked by for the 1995 Ford Windstar
Sounds like a wiring problem up at the steering column but the wiring needs to be looked at using a vehicle specific wiring diagram and volt/ohm meter to see where the fault is whether it be wiring or a failed switch. If you feel confident that you can read and follow wiring diagrams there are two companies that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have,much better than generic workshop manuals from parts stores and much cheaper than the factory manual try Alldata which is very easy to navigate or Mitchell on line and get an online repair manual subscription.
Thank you for your information regarding my goofy wipers .Now I need to get on it.
Thank you kindly.
1 more answer , 1 more comment
If controls are all on same arm then I suspect the combination switch. Have replaced a few of those for same problem. Sorry patrick, your answer popped up at same time as mine.
We've replaced dozen of combo switches for a variety of problems from not working together to only working together. Aftermarket units are very inexpensive.