1975 C10 with Volt Meter - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kennygss · 04-03-2021, 01:14 PM

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.

**Getter-Done** · 04-03-2021, 01:34 PM

Someone probably swapped that at some point in time.

Notice the difference of the (Tick) lines.

.

**hatzie** · 04-03-2021, 01:50 PM

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.

SCOTI · 04-03-2021, 01:51 PM

The 'font' is '81 up later model. It was swapped @ some point.
*Hatzie beat me to the punch*

kennygss · 04-03-2021, 01:54 PM

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.

**Getter-Done** · 04-03-2021, 02:14 PM

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

1984

1977

1973 modified
Name: 73.jpg
Views: 432
Size: 45.6 KB

.

**hatzie** · 04-03-2021, 02:15 PM

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.

Dead Parrot · 04-03-2021, 02:31 PM

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.

**bhc41051** · 04-03-2021, 04:08 PM

My 75 with Amp Gauge.

kennygss · 04-04-2021, 11:00 AM

Quote:

Originally Posted by Dead Parrot

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. . . .

kennygss · 04-04-2021, 11:01 AM

Quote:

Originally Posted by bhc41051

My 75 with Amp Gauge.

Your dash bezel is in excellent condition! Beautiful.

Pontiac1976 · 04-11-2021, 04:16 PM

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

04-03-2021, 01:14 PM	#1
kennygss Registered User Join Date: Jun 2019 Location: San Diego, Ca Posts: 13	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. Attached Images

04-03-2021, 01:34 PM	#2
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,417	Re: 1975 C10 with Volt Meter Someone probably swapped that at some point in time. Notice the difference of the (Tick) lines. . __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

04-03-2021, 01:50 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	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. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF 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.

04-03-2021, 01:51 PM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	Re: 1975 C10 with Volt Meter The 'font' is '81 up later model. It was swapped @ some point. Hatzie beat me to the punch __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

04-03-2021, 01:54 PM	#5
kennygss Registered User Join Date: Jun 2019 Location: San Diego, Ca Posts: 13	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.

04-03-2021, 02:14 PM	#6
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,417	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 1977 1973 modified . __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

04-03-2021, 02:15 PM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	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. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF 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.

04-03-2021, 02:31 PM	#8
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,611	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.

04-03-2021, 04:08 PM	#9
bhc41051 Senior Member Join Date: Apr 2012 Location: Otway OH Posts: 788	Re: 1975 C10 with Volt Meter My 75 with Amp Gauge. Attached Images

04-11-2021, 04:16 PM	#12
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	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. __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.



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