Here is the schematic for a 1968 I hope it is the same.

http://www.C3VR.com/member_pages/4201_4300/4221/1968-Wiper-Schematic.jpg 

Before the motor I would check the door limit sw. the ground for the motor goes through it then through the override sw. Check that the override sw is turned I think fully to the right to be off. I can send you a pdf file that explain the full operation if you pm me with your email

Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Reading through some older posts and came across electrical/wiper problems. I had a strange situation on my '73 when I purchased it that I could not find mention of in any Corvette forums. I'll call it "Wipers Won't Park".

Long story short, after some serious clean-up and other garbage detail I installed a new battery to see what kind of electrical issues I had. Most noticeable were the wipers, who refused to move when I used the switch and remained in the stopped but un-parked position.

After a few minutes of investigation, I quickly noted that the wiper motor was getting warm so I immediately disconnected the battery. First thought was something is bound up either in the motor or the arm assembly. Disconnected wiper motor/arms and found everything was okay. Using a couple procedures I found on line, I bench tested the motor and switch. All worked fine separately but when I hooked everything back up and connected the battery the wipers went back into their un-parked position. Things that make you go Hmmmm...........

Next disconnected everything and checked for voltage and continuity. All were fine until I got to the wiper motor ground wire which somehow showed 12.8 volts ??!! Reconnected everything except the ground wire, ran my own ground to the engine block and waa-laa, everything worked perfectly using the switch and no heat issues.

Tracing the wiper motor ground wire on the '73 schematic, I found it trailed to the hood alarm switch and the starter ground. Looking at the box of spare parts I received when I got the car, I noticed the starter heat shield and forward mounting bracket. Looks like the starter had been out for some reason, probably when the original owner's son and a buddy tried to put a clutch in the car and that didn't go so good.

The good news is that I had not tried to turn over the motor yet, so disconnect the battery and proceed to the starter. It took a while but I found a fried fuseable link and the starter ground wire that was supposed to be attached to one of the bell housing bolts had been installed with the main hot lead to the center starter terminal. I guess that's how you get 12.8 volts up through the ground wire !!

New fuseable link, connections back where they belong and the rest of the starter parts installed, wipers were fixed and I probably avoided frying the starter and a few other components.

I realize these circumstances are pretty bizarre and the chances of it happening to someone else are slim, but never say never. I hope this may help someone in the future who asks "Hey my wipers won't park ??"