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Old 04-03-2021, 01:14 PM   #1
kennygss
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1975 C10 with Volt Meter

Hi Guys,

I was hoping that someone might have some experience wit my situation. I have a 75 C10 Silverado with the factory gauges. All the inetrnet stuff I read says this truck should have an ammeter, but this one has a voltmeter. Anyone ever seen this ? Maybe a changeover model? It was sold new 10/13/74.
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Old 04-03-2021, 01:34 PM   #2
Getter-Done
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Re: 1975 C10 with Volt Meter

Someone probably swapped that at some point in time.

Notice the difference of the (Tick) lines.









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Old 04-03-2021, 01:50 PM   #3
hatzie
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Re: 1975 C10 with Volt Meter

The diameter of the needle base is larger on the volt meter and the number font is wider with a different character spacing from the oil pressure gauge.
1975 still had lettering rather than hieroglyphs. A 1975 VOLT gauge would've had VOLT at the bottom rather than the battery hieroglyph.
Someone retrofitted a later volt meter into that cluster.
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Old 04-03-2021, 01:51 PM   #4
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Re: 1975 C10 with Volt Meter

The 'font' is '81 up later model. It was swapped @ some point.
*Hatzie beat me to the punch*
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Old 04-03-2021, 01:54 PM   #5
kennygss
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Re: 1975 C10 with Volt Meter

Thanks guys, I thought it looked "newer", truck is pretty unmolested. It has a parasitic load problem.. Battery dies overnight. Probably get in there and find the original ammeter burned up and a short somewhere.
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Old 04-03-2021, 02:14 PM   #6
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Re: 1975 C10 with Volt Meter

Here is a picture of my 84 and 77 and 73.
The 73 was modified with new gages though

1984
Name:  84.jpg
Views: 286
Size:  37.1 KB
1977
Name:  77.jpg
Views: 296
Size:  45.2 KB
1973 modified
Name:  73.jpg
Views: 289
Size:  45.6 KB









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Old 04-03-2021, 02:15 PM   #7
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Re: 1975 C10 with Volt Meter

Both of the ammeter shunt wires will have a Bumble Bee inline glass cartridge fuse holder or something similar.
I'd start by removing those fuses.
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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...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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Old 04-03-2021, 02:31 PM   #8
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Re: 1975 C10 with Volt Meter

Possible the clock is a retrofit as well. On my 75, that is where the Brake light went. I think clocks rated a separate SPID listing.

I had a parasite drain issue on my 75. Turned out it was from the alternator. One of the diodes had partially broke down. It still charged normally, but would also drain the battery after a few days.
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Old 04-03-2021, 04:08 PM   #9
bhc41051
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Re: 1975 C10 with Volt Meter

My 75 with Amp Gauge.
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Old 04-04-2021, 11:00 AM   #10
kennygss
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Re: 1975 C10 with Volt Meter

Quote:
Originally Posted by Dead Parrot View Post
Possible the clock is a retrofit as well. On my 75, that is where the Brake light went. I think clocks rated a separate SPID listing.

I had a parasite drain issue on my 75. Turned out it was from the alternator. One of the diodes had partially broke down. It still charged normally, but would also drain the battery after a few days.

I think the clock is stock, its a Silverado with the gauge package, gas gauge is where a tach would be. That is the next project. . . .
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Old 04-04-2021, 11:01 AM   #11
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Re: 1975 C10 with Volt Meter

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Originally Posted by bhc41051 View Post
My 75 with Amp Gauge.
Your dash bezel is in excellent condition! Beautiful.
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Old 04-11-2021, 04:16 PM   #12
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Re: 1975 C10 with Volt Meter

I think the first year 81-up needle are plastic, 80 down are stamped alloy needles for the gauges if not touched.
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