Intro and Wipers
Thread Starter
Intermediate
Joined: Dec 2024
Posts: 33
Likes: 3
From: Las Vegas
Intro and Wipers
How’s everyone doing. Picked this base 78 up a couple of weeks ago and already tore the interior apart and redid the wiring harness. When I got it the wiper fuse wasn’t blown. I put the dash back together yesterday and plugged everything back in and the wipers turned on ran for a little then stopped. This seemed to happen when I tapped into the gray wire in the radio harness for power for my aftermarket radio (could’ve been a coincidence). Looking for help on trouble shooting this. I have the standard wipers without the intermittent controller in the console.
Race Director
Joined: Mar 2017
Posts: 11,923
Likes: 4,495
From: Virginia
Welcome to the Forum! Black bubble-window C3s are the best looking Corvettes.
Do you have a wiring diagram and a 78 shop manual, and assembly instruction manual?
FWIW, I think the the wipers are hot, with control through the ground circuit.
Wiring diagrams can be found here:
https://wordpress.keystonestatecorve...m/?page_id=118
Do you have a wiring diagram and a 78 shop manual, and assembly instruction manual?
FWIW, I think the the wipers are hot, with control through the ground circuit.
Wiring diagrams can be found here:
https://wordpress.keystonestatecorve...m/?page_id=118
Thread Starter
Intermediate
Joined: Dec 2024
Posts: 33
Likes: 3
From: Las Vegas
Welcome to the Forum! Black bubble-window C3s are the best looking Corvettes.
Do you have a wiring diagram and a 78 shop manual, and assembly instruction manual?
FWIW, I think the the wipers are hot, with control through the ground circuit.
Wiring diagrams can be found here:
https://wordpress.keystonestatecorve...m/?page_id=118
Do you have a wiring diagram and a 78 shop manual, and assembly instruction manual?
FWIW, I think the the wipers are hot, with control through the ground circuit.
Wiring diagrams can be found here:
https://wordpress.keystonestatecorve...m/?page_id=118
Safety Car
Joined: Oct 2007
Posts: 4,364
Likes: 1,724
From: Seattle Area Washington
On your 78 radio wiring power plug there should be 3 wires a Yellow, Black & Grey
The Grey wire is powered ONLY when the headlight switch is in 1st or 2nd position(s)
This circuit is protected by the short INST/LPS 6amp fuse...
The Grey wire is powered ONLY when the headlight switch is in 1st or 2nd position(s)
This circuit is protected by the short INST/LPS 6amp fuse...
Thread Starter
Intermediate
Joined: Dec 2024
Posts: 33
Likes: 3
From: Las Vegas
Welcome to the Forum! Black bubble-window C3s are the best looking Corvettes.
Do you have a wiring diagram and a 78 shop manual, and assembly instruction manual?
FWIW, I think the the wipers are hot, with control through the ground circuit.
Wiring diagrams can be found here:
https://wordpress.keystonestatecorve...m/?page_id=118
Do you have a wiring diagram and a 78 shop manual, and assembly instruction manual?
FWIW, I think the the wipers are hot, with control through the ground circuit.
Wiring diagrams can be found here:
https://wordpress.keystonestatecorve...m/?page_id=118
Thread Starter
Intermediate
Joined: Dec 2024
Posts: 33
Likes: 3
From: Las Vegas
That is correct. I’m thinking when I pulled the speaker wire across the dash it might’ve made something behind the wiper switch connect.
Race Director
Joined: Mar 2017
Posts: 11,923
Likes: 4,495
From: Virginia
http://www.keystonestatecorvetteclub...tte%201978.pdf
Works for me, but you may have to edit the "%20" to be a space
Thread Starter
Intermediate
Joined: Dec 2024
Posts: 33
Likes: 3
From: Las Vegas
That's odd. It's a direct PDF link.
http://www.keystonestatecorvetteclub...tte%201978.pdf
Works for me, but you may have to edit the "%20" to be a space
http://www.keystonestatecorvetteclub...tte%201978.pdf
Works for me, but you may have to edit the "%20" to be a space
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