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03-08-2022, 05:07 PM | #1 |
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Join Date: Jun 2021
Location: Gravette Arkansas
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Cluster ground plug in
Attached is a picture of the printed wire cluster harness on my 74 Chevy C20 pickup. Can anyone please tell me WHERE the ground plugs into the printed wiring harness? Sorry for the crummy picture. I hope you can use it.
- Denver9 |
03-08-2022, 08:59 PM | #2 | |
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Re: Cluster ground plug in
Quote:
That being said... There are several grounds on the instrument panel plug. The GM wiring manual for your 1974 will show the pinout. Look in my signature for the manuals. The other end of the ground wires is a ring terminal on the kick panel above the parking brake pedal.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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03-09-2022, 02:35 PM | #3 |
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Re: Cluster ground plug in
There is what appears to be a flexible ground strap in the cable (harness) that comes from the firewall connector and plugs into the printed wiring on the instrument panel. I would like to know WHERE it plugs into the printed wiring. BTW: I respectively submit that the printed wiring IS a harness; it just happens to be a "printed wiring" harness for convenience. My vehicle is a 1974 Chevy C20 3/4 ton pickup which I have previously posted. You mentioned that all of the ground wires are hooked to a chassis ground terminal. Is that connection made via the hard wired harness or do I need to somehow run a separate wire from the printed wiring to that aforementioned ground terminal? If I sound a bit confused, I definitely am, and I am seeking help to remove that confusion.
Thank you in advance, -Denver9 |
03-09-2022, 02:40 PM | #4 |
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Re: Cluster ground plug in
As mentioned, there are several grounds in the connector that plugs into the printed circuit. Unless someone has been in there cutting wires, just plug in the connector and send it.
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03-09-2022, 03:02 PM | #5 |
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Re: Cluster ground plug in
1974 ain't the 1960's. There's no ring terminal on the printed circuit or instrument cluster... if it hasn't been monkeyed with.
The ground wires are black jacketed 16ga copper trailing back into the harness from the cluster plug. They are spliced to a single larger gauge (12 or 14 IIRC) black wire about 6-8" from the cluster plug. This splice is taped over and bundled into the dash harness. From the above mentioned splice... that single black wire is bundled into the dash harness and runs from the splice to a ring terminal that's screwed to the kick panel above the parking brake pedal.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
03-12-2022, 11:26 PM | #6 |
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Location: Gravette Arkansas
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Re: Cluster ground plug in
Thank you for that explanation of how the ground wires are handled. I have found the ground connection on the kick panel that you spoke of, thanks. I would stiill like to know the purpose of that flat, flexible, cable or strap eminating from the hard wired harness and terminating in a round shaped flat connector that attaches somewhere on the printed wiring harness with about a 1/4 twist. That connector is a totally different configuration than the lamp sockets. I suspect it terminates in thzt hole just above and to the left of where you see the numbers 331 on the printed wiring harness picture I posted earlier.
Once again, my truck is a 1974 Chevy C20 pickup. Thanks for any comments that may help. - Denver9 Last edited by Denver9; 03-12-2022 at 11:35 PM. |
03-13-2022, 05:44 PM | #7 |
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Re: Cluster ground plug in
That sounds like you might be describing the fiber optic cable that is used to illuminate the windshield wiper switch ... I believe that was a 73/74 only thing, with 75-up going to a separate bulb for the wiper switch.
Some of the earlier years used a similar fiber optic to illuminate the automatic trans shift indicator on the column. And others used it to illuminate the ash tray. Anyway, the upper end of that fiber optic cable should be attached to a special socket that that twists (quarter turn) into one of the bulb openings. That special socket should also hold a #194 bulb and be installed into one of the cluster illumination locations ... doesn't matter which one as long as it will reach and is a cluster illumination (not turn signal indicator, high beam indicator, warning light etc.) location. |
03-14-2022, 12:43 PM | #8 | |
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Re: Cluster ground plug in
Quote:
You can still buy the fiber optic cable with terminators and maybe the lamp socket. The sheet metal holder for the terminators are junkyard scavenger hunt only.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 03-14-2022 at 12:52 PM. |
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