It has never opened since I have had the car. If I pull the bypass it doesn't open but I can pull it up and it will stay up and close when I push the bypass up. I started checking on this a couple years ago and realized some of the wires have been replaced. So I was just living with it. The biggest problem is if I turn the wipers on with the switch they try to come up with the door down. It's like the switch that is supposed to prevent this is bypassed. So I have two issues. 1door doesn't open. 2. Wipers try to run with door closed.
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Re: 72 wiper door
.Terry McManmon (3966)
On the firewall (BTW that is not the correct term, but everyone understands it) just to the passenger side of the wiper motor & washer pump is a rod that comes out of the chamber that the wipers park in. That rod presses on a switch with a button in the middle and two large red wires (one on each end IIRC). When the wiper door is up that button on that switch is released and power flows through that switch (on the two red wires) to the wiper motor. If the wiper door is down the button is pressed in and NO power flows through that switch and there is no power to the wiper motor and the wipers don't work.
If your wipers try to work with the door down the problem is (in no particular order):
1) the linkage to that button is not properly adjusted (or parts of the linkage are missing or bent)
2) the switch is malfunctioning and is closed all the time
3) someone has modified the wires by-passing the switch.
All three of those possibilities are either readily visible or easily tested with an electrical light probe or a voltmeter.Terry
1970 LT1 Mulsanne Blue
2008 Z06 Jetstream Blue
A couple of Gen II LT-1s in 9C1s
A Gen II LT-1 in a 1A2 - one of 154
and an LS1 in a B4C -- one
Terry, I know the wires have been messed with. I will test the plunger switch. I am cross eyed from looking at a wireing diagram trying to follow to see where they go. I am confused about the solenoid that send the signal to open the door. I cant make sence of it on the wireing diagram. Mine has two yellow wires and a blue.
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Re: 72 wiper door
Terry if I was a wizard it would have your avator at the top. I just copy and pasted the verbage to get it on the right thread. Now if reading the wireing diagram was that easy.Comment
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Re: 72 wiper door
Keith, The wiper door has a vacuum switch under the pass. side wiper blade that is always a problem with corvette wiper doors.The plunger on the switch will break sometimes internally and you won't know it unless the button is sitting in the cowl area.New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.Comment
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Re: 72 wiper door
Keith,
The easiest way I can explain it is to say the button/switch on the firewall is supposed to be your safety. Someone bypassed it. When the wiper door comes up and the arm hits that button it energizes the other side of the wire (closing that switch. That red wire with white on it I think, goes and turns into a light blue wire that now feeds power to the wiper switch.
So, as I suggested before, check and see if the switch on the firewall is normally open. Then I would go inside and see if the light blue wire on the wiper switch has power. If it has power, that is your problem. We just need to figure out where they cut the wire and jumped the switch on the firewall.
If it does not have power, your wiper should not be coming on at all. It sounds like a very simple switch. The vacuum system has a set of hoses on backwards..
First, tell me about the light blue wire at the wiper switch and the switch on the firewall. Once you tell me the status of those, I will tell you which hoses to swap to get the door working right again.
The fact that the wiper door closes when you close the override tells me it is a simple fix as well.
You just have two small things going on at the same time. This makes things seem much bigger than they really are.
monteComment
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Re: 72 wiper door
Keith,
It also sounds like your wiper door actuator switch is hooked up wrong.
First, let's get a couple of terms out of the way.
The Wiper Door Actuator Safety Switch is in the wiper bay on the passenger side. When the wiper goes all the way down, it rests on it.
The Wiper Door Actuator Relay is up under the passenger fender in the engine compartment.
right now it sounds like the override has the hoses on reversed. But, there is also a problem with the Acruator safety switch.
With the wipers up, you should have vacuum going to the small hose that goes to atmosphere. That Safety switch should have the hose closest to the plunger or where the wiper sits, the first one should be small and go to atmosphere. The middle one should go back inside to the override, and the far end on should go to the big end of the Actuator Relay.
The actuator Relay (Under the hood) should have a different vacuum supply going to the center port while the tow outside ports go to either side of the wiper door diaphragm that actually opens the wiper door to let the wiper out.
The easiest way to remember all there actuators is the middle of the three ports should always be vacuum supply. Also, the big end that has the diaphragm in it also has a vacuum supply as well. When a switch is switched on, the big diaphragm looses it vacuum and the plunger moves to whatever side is called for.
Do not worry about the override yet. as long as you do not mess with it, it is just a normally open switch that is open and doing its thing. We will address that later.
Let me know if you vacuum set-up was different than I explained.
best of luck,
MonteComment
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Re: 72 wiper door
I tested the button switch on the firewall and it test good. Power coming in and when button pushed power comes out, but there is power to wipers either way. I don't understand why they don't run all the time. Any time the switch is on there is power on all wires going into motor except the green one. The wipers operate on both speeds. I don't see any splices where something could be tied together. A couple ends I think for washer pump have terminals on them though. I will post s pic when I get home.
And there is power on the blue wire at the switch as soon as the switch is on.
I haven't even looked at the vacuum hoses yet.Comment
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Re: 72 wiper door
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Re: 72 wiper door
What is this plug for. It wasn't hooked up. I opened up the harness and the only thing tied together are these two black wires. They are hot with the switch on.
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Re: 72 wiper door
All these wires are hot as soon as the switch is on except the green one. If I unplug the three wire plug the red wire looses power also. But if I unplug the red wires the blue and yellow in the three wire plug stay hot.
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Re: 72 wiper door
Keith,
I have not gone through the pictures you posted yet, but there is one other thing I want you to check.
When you take the fuse out of the fuse panel, do the wipers still work. Does the switch on the firewall still have power.
If you can, check each wire on the wiper motor before and after, 4 wires going in the middle at the motor, 1 red wire on the right rear/side, 2 at the pump, and then a black one. I am working off memory, so I may have missed one.
I will take a look at the pictures, but I am not sure they will be much help.Comment
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Re: 72 wiper door
Keith,
After looking at your pictures, it looks like your wiper motor is very different than mine. The black plug you asked about is the main ground. It plugs in just about where your three wire plug is now while the three wire plug should be just to the left of where the wires go into the top of the motor.
When was your car built? I have learned that just because something does not look like what I have, first, maybe mine is wrong. Second, it might be a production change. My guess is in this instance is, it is the wrong wiper motor.
I will send you some pictures of my wiper motor to your regular e-mail address.
MonteComment
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Re: 72 wiper door
With switch on and wipers off power to wiper switch on blue and yellow. At wiper motor power is on lt blue and yellow but not green. Also power on both wires going into washer pump.
pulled wiper fuse and no power on any.
I've looked for a splice under hood and under dash with no luck.Comment
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Re: 72 wiper door
Monte. It's very early 72 built in aug of 71Comment
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