Gauge Cluster Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NW_Ryker · 04-03-2011, 11:14 PM

Hey everyone,
I'm in the final stages of getting my Blazer back together and I've hit a bump with the gauge cluster. The original one someone had painted over and the gauges were rusty, so I bought a new one. This one was out of an earlier GMC (It had the body color bezel). This one also had a tach, the original did not. When I hook it up, only the high beam indicator and brake warning work. The blinker lights and the gauge lights don't. What might be the problem? I know the circuit on the back is slightly different because of the tach, could my connector that goes into the circuit be wrong? Thanks in advance for any help you can give.

dmack91 · 04-04-2011, 02:50 PM

I am sure you are quicker than I was. None of my cluster lights worked when I bought the truck. I assumed it was a wiring issue. Found out that all bulbs were burned out due to a short in the printed circuit board (one of the printed circuits had been dislodged when someone put a little too much effort into seating a bulb). I cleared the short and replace d the bulbs and all was well.

Putter · 04-04-2011, 02:59 PM

Did you have a "7-hole" cluster before....or a "3-hole" idiot-light cluster?

MARKDTN · 04-04-2011, 04:24 PM

I think you have to move wires in the connector on the back. I know you do on a 73-87

NW_Ryker · 04-04-2011, 05:55 PM

Both are 7 holes. Mark, do you mean rearrange wires on the connector?

**john** · 04-04-2011, 06:28 PM

No need to rewire. Clean all sockets and connections and install new bulbs. Check for good ground.

04-03-2011, 11:14 PM	#1
NW_Ryker Registered User Join Date: Jul 2010 Location: Carnation Wa Posts: 199	Gauge Cluster Problems Hey everyone, I'm in the final stages of getting my Blazer back together and I've hit a bump with the gauge cluster. The original one someone had painted over and the gauges were rusty, so I bought a new one. This one was out of an earlier GMC (It had the body color bezel). This one also had a tach, the original did not. When I hook it up, only the high beam indicator and brake warning work. The blinker lights and the gauge lights don't. What might be the problem? I know the circuit on the back is slightly different because of the tach, could my connector that goes into the circuit be wrong? Thanks in advance for any help you can give.

04-04-2011, 02:50 PM	#2
dmack91 Registered User Join Date: Jan 2011 Location: Redmond, OR Posts: 760	Re: Gauge Cluster Problems I am sure you are quicker than I was. None of my cluster lights worked when I bought the truck. I assumed it was a wiring issue. Found out that all bulbs were burned out due to a short in the printed circuit board (one of the printed circuits had been dislodged when someone put a little too much effort into seating a bulb). I cleared the short and replace d the bulbs and all was well. __________________ 68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress

04-04-2011, 02:59 PM	#3
Putter More Cowbell.... Join Date: Mar 2004 Location: Puckett, MS Posts: 3,569	Re: Gauge Cluster Problems Did you have a "7-hole" cluster before....or a "3-hole" idiot-light cluster? __________________ *There once was a member from Puckett.....Who ( fill in the blank blank blank* ) bucket**

04-04-2011, 04:24 PM	#4
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,159	Re: Gauge Cluster Problems I think you have to move wires in the connector on the back. I know you do on a 73-87 __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project

04-04-2011, 05:55 PM	#5
NW_Ryker Registered User Join Date: Jul 2010 Location: Carnation Wa Posts: 199	Re: Gauge Cluster Problems Both are 7 holes. Mark, do you mean rearrange wires on the connector?

04-04-2011, 06:28 PM	#6
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Gauge Cluster Problems No need to rewire. Clean all sockets and connections and install new bulbs. Check for good ground. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 04-04-2011 at 06:29 PM.

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