C3 1978 wiring diagram
04-18-2018, 04:21 PM
#1
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C3 1978 wiring diagram
Hello , does anybody have a wiring diagram for a 1978 C3 , I’m replacing the whole loom from fuse box to engine bay, indicators and headlamps/main beam not working ,
brake lights , reversing lights , side marker lights are fine .. battery and clock gauges not working either, ......... any ideas guys , I think I need a wiring diagram
thanks
Mike.
brake lights , reversing lights , side marker lights are fine .. battery and clock gauges not working either, ......... any ideas guys , I think I need a wiring diagram
thanks
Mike.
04-18-2018, 05:35 PM
#2
Melting Slicks
Write to Papawana for a wiring diagram. He was prompt when I requested it. .
https://www.corvetteforum.com/forums...-papawana.html
https://www.corvetteforum.com/forums...-papawana.html
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Panzerino (04-18-2018)
04-18-2018, 07:34 PM
#3
Le Mans Master
Member Since: May 2003
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or you can download a PDF right here-
78- http://www.keystonestatecorvetteclub...tte%201978.pdf
all other years- http://wordpress.keystonestatecorvet...m/?page_id=118
78- http://www.keystonestatecorvetteclub...tte%201978.pdf
all other years- http://wordpress.keystonestatecorvet...m/?page_id=118
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Panzerino (04-18-2018),
ScottEwine (08-22-2020)
04-18-2018, 08:33 PM
#4
Melting Slicks
When I first got mt 78 I bought one of those laminated color coded sheets ( 2 actually with almost all of the options wiring on the back. A big help for me even though I am completely rewiring the car with an aftermarket kit. BIG sheets and easy to follow.
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Panzerino (04-18-2018)
04-19-2018, 12:26 AM
#5
Safety Car
In addition to the color-coded, laminated schematic (by Olsen Engineering) I use the 1978 GM Electrical Troubleshooting Manual with a Pace Car on the cover. The latter is great for troubleshooting and includes a table that describes the location of components. Its an 11 x 14, 34 page booklet and I've found them at swap meets as well as through Corvette literature vendors. I use mine frequently
So if, for example you're troubleshooting the power antenna, it tells the operator the relay is under the console, the antenna body is in the driver's side rear wheelwell (sort of), wire colors and how the circuit is intended to operate. Quite thorough. I've attached the anti-theft power door lock circuit.
Hope this helps!
So if, for example you're troubleshooting the power antenna, it tells the operator the relay is under the console, the antenna body is in the driver's side rear wheelwell (sort of), wire colors and how the circuit is intended to operate. Quite thorough. I've attached the anti-theft power door lock circuit.
Hope this helps!
09-20-2021, 07:33 PM
#6
In addition to the color-coded, laminated schematic (by Olsen Engineering) I use the 1978 GM Electrical Troubleshooting Manual with a Pace Car on the cover. The latter is great for troubleshooting and includes a table that describes the location of components. Its an 11 x 14, 34 page booklet and I've found them at swap meets as well as through Corvette literature vendors. I use mine frequently
So if, for example you're troubleshooting the power antenna, it tells the operator the relay is under the console, the antenna body is in the driver's side rear wheelwell (sort of), wire colors and how the circuit is intended to operate. Quite thorough. I've attached the anti-theft power door lock circuit.
Hope this helps!
Attachment 48275760
So if, for example you're troubleshooting the power antenna, it tells the operator the relay is under the console, the antenna body is in the driver's side rear wheelwell (sort of), wire colors and how the circuit is intended to operate. Quite thorough. I've attached the anti-theft power door lock circuit.
Hope this helps!
Attachment 48275760
09-20-2021, 07:57 PM
#7
Melting Slicks
I found mine on ebay
https://www.ebay.com/itm/36171897835...Cclp%3A2334524
here is one
That one looks like it is a black and white, probably not as useful as a color one
https://www.ebay.com/itm/36171897835...Cclp%3A2334524
here is one
That one looks like it is a black and white, probably not as useful as a color one
Last edited by bruiser; 09-20-2021 at 08:03 PM.
