Heater control panel light has gray wire that go to instrument cluster connection. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HeavyHauler · 03-25-2025, 11:42 PM

The wiring diagram for 1968 Chevy C10 says the gray wire for the heater control panel light goes to the instrument cluster connection.

Where is that located at?

**Rust_never_sleeps** · 03-26-2025, 01:53 AM

In the dash, plugged into the back of the instrument cluster

**Richard** · 03-26-2025, 05:09 PM

There is a location on the fuse panel. Used to have my tilt column light plugged into there. Things are a bit different now with the new AAW harness.
Had my old fuse panel in a box and took a pic for you.

HeavyHauler · 03-26-2025, 06:41 PM

Hey thanks! But I was looking for the instrument cluster connection. According to the above post it is located right on the back of the dash panel.

68 TT · 04-02-2025, 02:46 PM

Mine has the secondary gauges so the wiring isn't the same as a speedo and fuel gauge only truck but the heater bulb socket is connected into pin 8 on my gauge cluster.

**Rust_never_sleeps** · 04-03-2025, 01:15 AM

The connector is #13. It's in the pdf manual, which you can download off this site

**mojavetrucker** · 04-03-2025, 03:41 PM

Here are a couple of photos of my ‘68 C10 heater control light pigtail and the instrument cluster connector as it appears when still plugged in. The single gray wire pigtail connector from the heater control light plugs into a connector with two gray wires.

The instrument cluster connector has one gray wire on the top row of the connector. The top row is colored as follows: black, gray, dark blue, light blue, light green and possibly black on the passenger side top end.

The bottom row: dark green, blank, brown, red/pink?, brown and black (?) on the passenger side bottom row.

I have highlighted the gray wire with an arrow on the instrument cluster connector. I know it looks like a black wire in the photo because of how it’s shadowed, but it’s gray.

The photo that 68 TT provided looks to be the same way that mine is wired.

These are looking up, so try to get your orientation correct.

HeavyHauler · 04-06-2025, 09:59 AM

Quote:

Originally Posted by 68 TT

Mine has the secondary gauges so the wiring isn't the same as a speedo and fuel gauge only truck but the heater bulb socket is connected into pin 8 on my gauge cluster.

Thanks! I located what I think is the black female connector that the heater light plugs into and it looks like it leads back to the instrument cluster connection. Thanks guys!

HeavyHauler · 04-06-2025, 10:01 AM

Quote:

Originally Posted by mojavetrucker

Here are a couple of photos of my ‘68 C10 heater control light pigtail and the instrument cluster connector as it appears when still plugged in. The single gray wire pigtail connector from the heater control light plugs into a connector with two gray wires.

The instrument cluster connector has one gray wire on the top row of the connector. The top row is colored as follows: black, gray, dark blue, light blue, light green and possibly black on the passenger side top end.

The bottom row: dark green, blank, brown, red/pink?, brown and black (?) on the passenger side bottom row.

I have highlighted the gray wire with an arrow on the instrument cluster connector. I know it looks like a black wire in the photo because of how it’s shadowed, but it’s gray.

The photo that 68 TT provided looks to be the same way that mine is wired.

These are looking up, so try to get your orientation correct.

Awesome! This further confirms that I have found the correct connector for the light. Thanks!

Accelo · 04-06-2025, 04:32 PM

There is a single bulb if the heater is standard and two bulbs if you have air conditioning.

03-26-2025, 01:53 AM	#2
Rust_never_sleeps Senior Member Join Date: Jun 2022 Location: San Ramon,CA Posts: 1,071	Re: Heater control panel light has gray wire that go to instrument cluster connection In the dash, plugged into the back of the instrument cluster __________________ 1970 C10 Custom longbed 350/350 “Carburetors are forgiving, timing is not” — Thunderhead289

03-26-2025, 05:09 PM	#3
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 3,346	Re: Heater control panel light has gray wire that go to instrument cluster connection There is a location on the fuse panel. Used to have my tilt column light plugged into there. Things are a bit different now with the new AAW harness. Had my old fuse panel in a box and took a pic for you. Attached Images __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

03-26-2025, 06:41 PM	#4
HeavyHauler Registered User Join Date: Nov 2011 Location: USA Posts: 534	Re: Heater control panel light has gray wire that go to instrument cluster connection Hey thanks! But I was looking for the instrument cluster connection. According to the above post it is located right on the back of the dash panel.

04-02-2025, 02:46 PM	#5
68 TT Still plays with trucks Join Date: Jul 2009 Location: Spokane, WA Posts: 3,574	Re: Heater control panel light has gray wire that go to instrument cluster connection Mine has the secondary gauges so the wiring isn't the same as a speedo and fuel gauge only truck but the heater bulb socket is connected into pin 8 on my gauge cluster. Attached Images __________________ 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been https://67-72chevytrucks.com/vboard/...d.php?t=484426 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E

04-03-2025, 03:41 PM	#7
mojavetrucker Junior Member Join Date: Mar 2025 Location: Joshua Tree, CA Posts: 22	Re: Heater control panel light has gray wire that go to instrument cluster connection Here are a couple of photos of my ‘68 C10 heater control light pigtail and the instrument cluster connector as it appears when still plugged in. The single gray wire pigtail connector from the heater control light plugs into a connector with two gray wires. The instrument cluster connector has one gray wire on the top row of the connector. The top row is colored as follows: black, gray, dark blue, light blue, light green and possibly black on the passenger side top end. The bottom row: dark green, blank, brown, red/pink?, brown and black (?) on the passenger side bottom row. I have highlighted the gray wire with an arrow on the instrument cluster connector. I know it looks like a black wire in the photo because of how it’s shadowed, but it’s gray. The photo that 68 TT provided looks to be the same way that mine is wired. These are looking up, so try to get your orientation correct. Attached Images Last edited by mojavetrucker; 04-03-2025 at 03:46 PM.

03-25-2025, 11:42 PM	#1
HeavyHauler Registered User Join Date: Nov 2011 Location: USA Posts: 534	Heater control panel light has gray wire that go to instrument cluster connection. The wiring diagram for 1968 Chevy C10 says the gray wire for the heater control panel light goes to the instrument cluster connection. Where is that located at?

04-06-2025, 04:32 PM	#10
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,426	Re: Heater control panel light has gray wire that go to instrument cluster connection There is a single bulb if the heater is standard and two bulbs if you have air conditioning.



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