Dash/Electrical help please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ChevyDude · 08-06-2003, 06:29 PM

My old 72' non tach dash looked like "sheet" and the gas gauge and P brake (red warning ) lights were not working. I ordered and just got today a new reproduction black/chrome with tach and vacuum gauge set up from GMC Pauls. It looks fantastic everything works except what did not work before.....gas gauge and red warning lights also can get it to light up at in dark. All these are the same problems I had with the old dash cluster. It has got to be wiring.....no??? Anyone with any ideas?

Thanks

Longhorn Man · 08-06-2003, 06:52 PM

Where does the fuel guage needle sit? At way past full, or way under empty, or where ever you place it with your finger.
If it is Under empty, the brown wire is grounded somewhere...normally under the chrome trim in the door jamb.

If pegged, then your brown wire is cut or disconnected.

If it stays where ever you place it with your finger, then there is no power going to the guage.

*Brown wire is the one that goes from the fuse box to the fuel tank*

jhow66 · 08-07-2003, 12:42 PM

The red warning light is not for your parking brake-it is the light for brake problems in system. Look under your MC and there will be a tan wire going to the porp. valve. Turn switch on and unplug this wire and ground it. Red light should glow. If one side of your brakes go out(front or back) the porp. valve will ground and cause the light to come on warning you of a brake problem.

tom hand · 08-07-2003, 06:00 PM

On my 72 the red "BRAKE" light does double duty. It goes on and off with the park brake and stays on if you have a brake problem. The brown wire goes to the prop valve and a switch on the parking brake

jhow66 · 08-07-2003, 08:31 PM

tom hand--did they come from factory that way? I have a 71 Cheyenne that did not have the parking brake switch. (added one to mine.)

ChevyDude · 08-07-2003, 10:17 PM

Just got back from my mechanic friends shop....As it turns out the sending unit in the relocated gas tank is not working. I will order a new one tomorrow. As for the red brake light....it remains to go on and off...mostly on. I will try to determine what the problem is???

Thanks for any help so far!

08-06-2003, 06:29 PM	#1
ChevyDude Senior Member Join Date: Jun 2003 Location: Westminster, CO Posts: 3,071	Dash/Electrical help please My old 72' non tach dash looked like "sheet" and the gas gauge and P brake (red warning ) lights were not working. I ordered and just got today a new reproduction black/chrome with tach and vacuum gauge set up from GMC Pauls. It looks fantastic everything works except what did not work before.....gas gauge and red warning lights also can get it to light up at in dark. All these are the same problems I had with the old dash cluster. It has got to be wiring.....no??? Anyone with any ideas? Thanks __________________ Alex 1971 Lil' Red 350 SBC 700R4

08-07-2003, 12:42 PM	#3
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	The red warning light is not for your parking brake-it is the light for brake problems in system. Look under your MC and there will be a tan wire going to the porp. valve. Turn switch on and unplug this wire and ground it. Red light should glow. If one side of your brakes go out(front or back) the porp. valve will ground and cause the light to come on warning you of a brake problem. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

08-07-2003, 06:00 PM	#4
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	On my 72 the red "BRAKE" light does double duty. It goes on and off with the park brake and stays on if you have a brake problem. The brown wire goes to the prop valve and a switch on the parking brake __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

08-07-2003, 08:31 PM	#5
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	tom hand--did they come from factory that way? I have a 71 Cheyenne that did not have the parking brake switch. (added one to mine.) __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

08-07-2003, 10:17 PM	#6
ChevyDude Senior Member Join Date: Jun 2003 Location: Westminster, CO Posts: 3,071	Just got back from my mechanic friends shop....As it turns out the sending unit in the relocated gas tank is not working. I will order a new one tomorrow. As for the red brake light....it remains to go on and off...mostly on. I will try to determine what the problem is??? Thanks for any help so far! __________________ Alex 1971 Lil' Red 350 SBC 700R4

08-06-2003, 06:52 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Where does the fuel guage needle sit? At way past full, or way under empty, or where ever you place it with your finger. If it is Under empty, the brown wire is grounded somewhere...normally under the chrome trim in the door jamb. If pegged, then your brown wire is cut or disconnected. If it stays where ever you place it with your finger, then there is no power going to the guage. Brown wire is the one that goes from the fuse box to the fuel tank

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