Intro and Wipers

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Dec 10, 2024 | 08:25 AM

aaronjoshua92

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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.

Dec 10, 2024 | 09:38 AM

Bikespace

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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

Dec 10, 2024 | 10:40 AM

aaronjoshua92

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From: Las Vegas

Quote:

Originally Posted by Bikespace

Thank you. I do have the electrical troubleshooting manual but not an assembly manual. I’m going to check the plug at the wiper motor for power tonight

Dec 10, 2024 | 10:56 AM

bmotojoe

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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...

Dec 10, 2024 | 10:58 AM

aaronjoshua92

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Quote:

Originally Posted by Bikespace

Thanks for the link but it won’t let me click the 1978 link cause it thinks it’s a phone number lol.

Dec 10, 2024 | 11:00 AM

aaronjoshua92

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Quote:

Originally Posted by bmotojoe

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.

Dec 10, 2024 | 11:22 AM

Bikespace

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From: Virginia

Quote:

Originally Posted by aaronjoshua92

Thanks for the link but it won’t let me click the 1978 link cause it thinks it’s a phone number lol.

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

Dec 10, 2024 | 11:35 AM

aaronjoshua92

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From: Las Vegas

Quote:

Originally Posted by Bikespace

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

That one worked. I was trying to click the general manuals link.