I'm Working on a 1987 Porsche 944 thats been sitting since at least 2006 for a lady. Until about two weeks ago i have never touched a porsche and still know very little about them. After replacing numerous parts that were ruined due to leaving gas in the tank for at least five years I got it running but wipers only had one speed and don't park. Tested wiper switch it was bad, replaced switch with oem, got two speeds still didn't park. Tested wiper motor - bad, replaced motor with oem got three speeds no intermittent, wipers still don't park. Replaced wiper delay timer/relay no change. I have no ideas on where to go next or what to look for anybody with any ideas would be greatly appreciated. I would like to get the car back to the lady fixed right beings that shes spent a ton of money on it but our local porsche dealer(200 miles away) is not helpful at all.

Thanks Dan