C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Apr 18, 2021 | 11:06 AM
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Please take a look and see if

there would be a reason for the harness to not go into cluster correctly. The bottom 'clicks" in but the top wont.
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Old Apr 18, 2021 | 11:13 AM
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where is the bottom? bottom of pic? or left side? if bottom is left, move camera more toward the "bottom" and take a pic of the plastic the top clicks into. looks like it may have some broken off. if so, you may have to fire up a big soldering iron and plastic weld some meat back in. it would require disassembly of the whole cluster. and some searching the plastic casting for PPE or HDPE or any other plastic identifier so you can get the right stuff to build the area back up. unless somebody on here knows what plastic the cluster is made from?
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Old Apr 18, 2021 | 11:20 AM
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The left side is the top. Only the first four are used.
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Old Apr 18, 2021 | 11:47 AM
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Originally Posted by michaelroy
The left side is the top. Only the first four are used.
If you look at the connector housing locks, there is a wide side (bottom) and a narrow side (top)
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Old Apr 18, 2021 | 12:02 PM
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always take a few pics...up-close/the whole assembly/problem area
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Old Apr 18, 2021 | 01:30 PM
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This looks like the only orientation for this plug. Won't fit the other way at all. Pins at the top.
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Old Apr 18, 2021 | 05:33 PM
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Different sizes ?
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Old Apr 18, 2021 | 06:20 PM
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Originally Posted by michaelroy
This looks like the only orientation for this plug. Won't fit the other way at all. Pins at the top.
Other than the spring loaded design of the brass terminals I see no reason why that shouldn't snap right into the cavity.
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Old Apr 18, 2021 | 06:27 PM
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Do you have calipers? Check the width of the small retention clip (bottom), in @bazza77's image. Compare to the slot for that part of the clip on the back of your instrument cluster.

Is the clip misaligned? Is the wiring harness OEM? Is the instrument cluster OEM (I don't think they make repros of this part).

This is likely a 78 dash with the original PCB.



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Old Apr 18, 2021 | 08:59 PM
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Its a PITA
line it up..straight on don’t damage the connectors...
pull wire out as far as possible..
maybe some smaller hands
still easier than console

Last edited by interpon; Apr 18, 2021 at 09:01 PM.
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Old Apr 19, 2021 | 10:39 AM
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I am trying the old PCB this morning. Perhaps the instrument guy did something wrong? The plug fits fine, just not making proper contact. I think this car is haunted.
If you touch all the pins in the harness would the test light shine on all except the two grounds?
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Old Apr 19, 2021 | 03:51 PM
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Well just like everything on this processed car only achieve partial success. I put on the OLD pcb and everything in the speedo pod except the left turn signal and bright light indicator bulb works. I'll settle with that. Both of my hands are a bloody mess and I've had a headache since I started. Took over a year and 6 mechanics to find a leaking caliper. This car, although I think it's beautiful, will be gone ASAP.
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Old Apr 19, 2021 | 07:03 PM
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Hope it's not too late, Yes this connector is a pain. What I do is remove the inside of the glove box, then reach in from there to plug it in. Remember the sides are different to prevent it from going in wrong, so mark the side with the smaller "key" so you know what goes where. Good luck.
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