Interior Dash & Console
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The Best of Corvette for Corvette Enthusiasts
As for the car, I have been mired in the wiper system for some time now. I am removing the vacuum system (except for power brakes), which of course changes how the wiper door needs to be actuated. Plus, I am doing a complete custom wire job, so I haven’t been able to use any existing switching, relays, or circuits, so I have had to figure out how all of this nonsense fits together. While it isn’t really terrible, I guess I didn’t pay close enough attention in my electrical engineering classes as it has been a bit of an uphill battle. There is just a lot going on in this system from the wonky ground-combination-signals required to do Hi/Lo/Park on the wiper motor, to the logic of waiting on door open before wipers go and then wipers park before door close, kill switch, etc…
Anyhow, I got it all working today! Here is the story…First, I got the wiper bay all cleaned of debris and mouse leftovers. I removed the wiper arm assemblies and gave it a good bed liner coating…turned out pretty nice:
Then, I got to work figuring out how to wire this mess to get it all to work. What ended up being required was 8 relays, a handful of diodes, limit switch, linear actuator, and bell crank…that’s all! I ended up making (3D print) a mount that goes on the tunnel in front of the head unit to hold all of the growing electronics mess. Then on the mount go panels that each can hold whatever they need to. Here is a pic:
On the far-left panel is the control unit for the Restomod air unit that will be going in. Then the next two panels together hold the 8 relays for the whole wiper system. These relays interact with the three switches dangling on the side of the tunnel ([Wash Hi/Lo], [Wash], [Kill]) as well as the wiper motor, door safety switch, wipe park to orchestrate everything. Here is a screenshot of the electrical diagram of this part of the system…in this you can see the 8 relays and the 3 switches; there are three additional lighting switches that aren’t in the car yet but are here as everything in the diagram is relatively located to its actual position in the car (not to scale) and these three switches will be just to the left of the three wiper switches…all of the wire colors match actual wire colors…mostly...I think:
One thing to note: I could have sworn I had read (and was completely confident) that the kill switch interrupted the ignition 12V to the wiper motor. Everyone probably knew this but me and it is probably super easy to research, but my confidence got in the way and it took me absolutely forever to figure out, only after dumb luck trying it, that the kill switch actually interrupts the constant 12V to the wiper motor, NOT the ignition 12V. Live and learn.
For the door control, I ended up replacing the vacuum system with the linear actuator/bell crank seen in the image below. It all works…operator turns on wiper hi or low, linear actuator retracts, bell crank pushes pushrod in, door opens and wipers wait to start until door is open (although my door open safety switch had a loose connection that sometimes worked and other times didn’t, which made it fun to debug this system!). Anyhow, operator turns wiper off, wiper parks while door waits until park limit is closed (pic below) and then door closes. The 2 pics below show first the fully assembled wiper bay including the “wiper parked” limit switch (I put a piece of large heat shrink tube over the base of the wiper arm as the limit switch looked like it could eventually scratch through the paint of the wiper arm, so I thought this was a nice way of protecting the arm and giving the limit switch a nice rubber surface to roll against) and then after the door open/close actuator:
This all ended up taking a ton of time to figure out. I know there are kits available for this. I didn’t do it on my own to save money, but it the end, the parts for the wiper door actuator and park limit switch (which is comparable to what you get in the packages plus some relays) was probably $150 whereas the kits on the wiper door are I think close to $800. I will pretty mine up at some point, but just some intel for ya.
One other point is that you will see in the picture above the newly mounted wash fluid reservoir. This is next up as I not only moved away from the “baggie” reservoir (WTF????) but am also changing the spray nozzles. It is like they ran out of time or just said screw it on these things. The bag system, while I understand space constraints, is comical. And the spray nozzles on my car were literally hand bent tubes that just kinda stick out of the wiper arms….we can do better. Anyhow, there is now a legit reservoir. It is tucked waaaayyyyy inside the pax fender well, so I have to work out a better filler nozzle (watching me try to fill that thing is also somewhat comical). But the new wash system is going to be a ton better.
That’s all for now…had it out on the road testing a fix to the power steering that is all now sorted thanks to a 64 degree Indiana winter day and now she is back on the lifts! I once the washers are done I will turn back to the interior to get more dash and HVAC moving now that a bulk of the wiring madness will be behind me. I do think I will switch out the firewall pass through for through-panel connectors somewhere along the lines as well.
Last edited by neptune2528; Dec 28, 2025 at 02:36 PM.














