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78 G10 printed circuit gauge
#772772 March 13th 2021 6:57 pm
Joined: Feb 2021
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stranger
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Hello, Im currently rewiring my 78 G10 chevy. The previous owner had aftermarket gauges installed (poorly) Im installing a factory gauge cluster. Curious to know if anyone out there has the schematics for the 16 pin terminal that connects into the gauge cluster. Or if anyone knows of a way to decode the circuit board to get the correct terminal location. Thanks much

Attached Files IMG_1664.jpgIMG_0342.jpg
1 member likes this: Matman
Re: 78 G10 printed circuit gauge
coryjohn78 #772791 March 14th 2021 1:52 am
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Did the previous owner cut the wiring harnesses out too? If that's the case, the easiest thing to do would be to find another 78-ish parts van and grab the matching harnesses. I just too a wiring out of the 71-77 clip I'm tearing apart, but I'm betting that's different from your 78 since the gauges are different.


[Linked Image from live.staticflickr.com]

Re: 78 G10 printed circuit gauge
kursed #772937 March 16th 2021 4:37 pm
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Yeah, they cut the whole pigtail connector out and added some cheap aftermarket gauges. I'm sure I'll end up having to pull one. Haven't been having any luck finding the right year though.

Re: 78 G10 printed circuit gauge
coryjohn78 #773202 March 19th 2021 10:36 pm
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I have the same cluster on my '80.
I did a quick trace of the circuits from the pin-out for the connector on the back of the cluster then made this messy attempt to label them. Some of the labels are incomplete since I was just trying track down lighting issues. I haven't double checked this so proceed with caution but maybe it will help
[Linked Image from i.postimg.cc]

I used a pencil to keep my eye on the circuit and followed them from beginning to end, then scrawled what I found on the paper

Last edited by vaNsquared; March 19th 2021 10:38 pm.
2 members like this: Matman, coryjohn78
Re: 78 G10 printed circuit gauge
vaNsquared #773839 March 30th 2021 4:24 pm
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stranger
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Thank you, vaNsquared this helps a lot! L turn signal is terminal 1 on the connector correct?

Re: 78 G10 printed circuit gauge
coryjohn78 #773972 April 01st 2021 2:48 pm
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No problem, anytime!

Yes, if you're looking the connector socket from the back of the cluster like you have in your photo, and numbering them left to right, top to bottom smile

I can probably explain better with a photo or two haha.
It's the straightened light blue wire.
[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]
This is out of an '81 Vandura with the same cluster so the colors should be the same

1 member likes this: Matman
Re: 78 G10 printed circuit gauge
vaNsquared #775660 May 05th 2021 8:11 am
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Hi VaNsquared,
Just reading your responses made me wonder if its possible to buy the printed circuit boards? Mines an `80 Chevy Shorty. I`ve repaired it and so far so good but always in the back of my mind, will it fail one night?

Re: 78 G10 printed circuit gauge
vaNsquared #778369 June 28th 2021 6:25 pm
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stranger
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Thanks VaNsquared!
Sorry for the delayed response, been busy! Got everything dialed in and working properly.

Re: 78 G10 printed circuit gauge
Matman #778370 June 28th 2021 6:27 pm
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stranger
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Hey Matman, I've searched for them new but haven't been able to find any. I do have a couple extra in really nice shape if your printed circuit board is the same as a 78.


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