Alright smart people. I need some help. I'm trying to button up my build and my wiper door situation is holding me back.

When I turn the car on it builds vacuum and the wiper door opens. It stays open the whole time even when I turn the car off. The wiper door goes down when I unhook the battery. (I can hear the vacuum solenoid venting to the atmosphere behind the dash)

Additionally the wiper override light stays on. Regardless of how the override is switched. My wipers do not operate I believe due to this. The only circumstance the light goes out (but can still see it barely illuminated) is when I depress the wiper door position switch on the firewall. When I press the wiper switch on the dash I hear a click in the motor which I believe is the motor trying to engage the pump. But when I switch left to right nothing happens.

I've got a new wiper motor new dash harness new engine harness old wiper switch old override switch old solenoid and old door position switch.

I recently repaired my gauge surround with a metal splint and JB weld. It SHOULD have a decent ground.but I added a ground to the dash support for good measure.

I seen one post from 2014 where they said The only way for the override lamp to turn on on the gauge cluster is for the wiper door limit switch to be fully depressed. Like I said before the light never really goes out unless I press the switch in but even then it's more dim than anything else.

Any thoughts would be appreciated.

 

Your wiper override switch (black **** at lower edge of the driver's dash panel, below the steering column) is ON. Rotate it to turn it OFF. This feature is used when you wish to change wiper blades.

 

The light stays on either way I switch that switch Below the dash. It's grounded as well. The only time the light goes out is when the switch is in the off position and the wiper door limit switch is depressed. Even then the bulb is slightly illuminated.

 

I pulled the wiper limit switch and just bypassed the connector with the jumper. The light went out but but was still faintly seen. Should I be chasing grounds? Or looking for something else?

 

the over ride switch connects the system ground. If you bypass the switch and run it straight to ground and the system does something different the switch may be bad. You should remove it and check it for continuity. There is also a ground from the wiper motor to the fan housing.

I also ran a ground from my wiper switch to the dash frame to ensure the bezel didnt play a part in any issues

Have you checked the willcox site for the 68 wiper system. Im sure you found out it s different from all the other years. Hopefully its a 68 motor as the other years wont work. THere is a bench test you can do from with the motor installed. If it works then you can rule it out and check the soenoids and the other grounds.

http://repairs.willcoxcorvette.com/w...8-1968-rev.jpg

http://repairs.willcoxcorvette.com/1...t-wiper-motor/

wiper motor ID
http://repairs.willcoxcorvette.com/1...ure-1968-only/
heres a lot of 68 tech from Willcox
http://repairs.willcoxcorvette.com/?yt=1968&s=wiper

 

Yeah it's a 68 Motor I bought new from Wilcox.
Wiring is from lectric limited. Is it possible there's something in the motor that I need to look at? I can bench test it but the schematic I'm reading doesn't show that light or override switch really runs through it.

Also don't know why the solenoid is powering regardless of what position the wiper switch is in. Maybe my switch is wacked.

 

I'll check the ground I have at the bellhousing tonight or tomorrow

 

I would trust Willcox to sell you a good part as they always do, but I would not assume that just because the wiring harness is new from lectric limited it has all the wires plugged into the connectors in the right place. It's been a few years since I installed my new lectric limited but it had numerous wires in the wrong places.

 

I'm going to relocate my ground. The one near the starter was attached to the bellhousing but on top of a bracket on a painted housing. I will relocate it to the designated position in the AIM which is at the starter bolt location. See if that changes anything

 

Use the Willcox updated schematic I linked to, most are incorrect. He also lists where you should see power and when acrosss the bottom and it exp;Latin’s why the light is on...And I’m sure you are aware to get the motor to run You have to either short across the door limit switch or unplug it and short across the connector unless you reinstall it..

On the switch, yes it is probably bad, you can bypass it and put the wire straight to ground on a 68 as it just connects ground
keep us updated

 

I'll keep tracking with the willcox stuff. Yeah I'll get the meter on stuff and track what I see where.

I just haven't seen a whole lot for why that override seems constantly engaged. But I'll start with good quality grounds.

 

Well like you mentioned it could be bad or the ground wire that goes from the bracket could have a bad connection on either end. It is frustrating I know, but if you keep going you will win. That rotary switch is connecting ground and when ground is disconnected the electricity is still seeking ground and a finds it through the light bulb illuminating it..It is weird but it a 68 , weird is normal

 

For sure. It's the last weird thing to put a bow on before I can button up the dash and console and wiper and door stuff. I'm ready to be done building and just maintaining.

 

Make sure you let the wipers complete a cycle before starting the troubleshooting.... otherwise, if interrupted, the circuit remains energized and will draw down your battery. see here: https://www.corvetteforum.com/forums...post1601348824

 

Relocated ground to the starter. All circumstances the same.

When I depress wiper limit switch by hand all the way the full on wiper override light shows dim (below)

 

One of your other grounds may be suspect. And your switch may still be an issue. Chasing the light might be a symptom, not the actual problem
ALSO....
How is your wiper switch connected, they can be put on backwards sometimes. The door openning when you start the car and not going down until you disconnect the battery lends me to believe the solenoid or relay is energized with the switch off is another issue. Have you tested the relay and the wiper solenoid on the tach to see whats up with them. You may have to trace power back and see why its energizing. It may be why your getting your partial light.

Try unplugging the wiper switch and see if any of the symptoms go away

 

I removed the switch and no change. I removed the ground to the motor and no change. I removed the 3 prong connector with the black red and brown and /blue brown and red and the light went out.

 

do the motor bench test, the power to the brown wire should only be there with the motor running. The ground on the brown should be there with everything grounded through the switches. If the lights lighting the blue ground from the motor may be bad

 

So if my solenoid is activated. That means my brown wire has 12 volts and is running. So I don't know what's telling it to run. Because it would open the door with the motor hooked up but the switch at the dash unhooked.

 

Ill do the bench test. I have the motor out so might as well.