Stock Three Hole Cluster ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

54blackhornet · 07-31-2021, 04:02 PM

With the ignition on, engine off, how many idiot lights should appear ? I only have generator and oil showing. Is this normal ? Water temperature light has never lit up...thanks

**Steeveedee** · 07-31-2021, 04:28 PM

The temp light should illuminate when the key is in the "start" position. I think that the oil light should too, although when the engine isn't running, the light would be on, anyway.

zosoppp · 07-31-2021, 05:34 PM

Temp and brake warning lights should come on only while the key is in the cranking position.

As mentioned the generator and oil pressure lights would normally be on when key on but not running. They might go out while cranking (especially the oil one).

54blackhornet · 07-31-2021, 06:11 PM

When I turn the key to the first position I have a oil pressure and generator light. So the other two lights in the fuel gauge on right should be parking brake & temperature ? ...thanks...they have never worked ?

zosoppp · 07-31-2021, 07:05 PM

Quote:

Originally Posted by 54blackhornet

When I turn the key to the first position I have a oil pressure and generator light. So the other two lights in the fuel gauge on right should be parking brake & temperature ? ...thanks...they have never worked ?

The Brake warning is from the distribution block, not the e-brake pedal/handle. If the front or rear service brakes lose pressure it should illuminate.

54blackhornet · 08-01-2021, 01:27 PM

So the temperature light does not come on in the on position to indicate it’s functional ? Like the gen and oil pressure ?

zosoppp · 08-01-2021, 07:38 PM

Quote:

Originally Posted by 54blackhornet

So the temperature light does not come on in the on position to indicate it’s functional ? Like the gen and oil pressure ?

No, when you are in the cranking key position, the brake and temp lights should light up for test.

54blackhornet · 08-02-2021, 03:42 PM

Mine do not light up ever ? How can bulbs that only illuminate for a moment burn out ? Guess it’s time to pull the cluster.

zosoppp · 08-02-2021, 04:01 PM

If they don't light up, it could be:
bad/missing bulbs
ignition switch not grounding
ignition switch not making the temporary contacts
missing/damaged wiring to the ignition switch (dark green for temp, tan for brake)
bad/dirty contacts on the panels printed circuit either at the harness plug or at the bulb socket holes.

bulbs often blow from the thermal shock of turning on when cold.

**pjmoreland** · 08-02-2021, 04:22 PM

You should be able to remove the brake and temperature bulbs from the back of the cluster without removing the cluster from the dash.

54blackhornet · 08-02-2021, 04:28 PM

Thanks fellas for all your help ! I really appreciate the information about the bulbs..Jack

07-31-2021, 04:02 PM	#1
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,255	Stock Three Hole Cluster ? With the ignition on, engine off, how many idiot lights should appear ? I only have generator and oil showing. Is this normal ? Water temperature light has never lit up...thanks __________________ 71 C-20 07 Magnum RT AWD

07-31-2021, 04:28 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,088	Re: Stock Three Hole Cluster ? The temp light should illuminate when the key is in the "start" position. I think that the oil light should too, although when the engine isn't running, the light would be on, anyway. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

07-31-2021, 05:34 PM	#3
zosoppp Registered User Join Date: Mar 2014 Location: Lincoln Park, NJ Posts: 189	Re: Stock Three Hole Cluster ? Temp and brake warning lights should come on only while the key is in the cranking position. As mentioned the generator and oil pressure lights would normally be on when key on but not running. They might go out while cranking (especially the oil one). __________________ 1970 C10 LWB 350SBC, SM330 Muncie (not saginaw SM326) (on tree), 3.07 open (assumed), PS, PB, Idiot lights

07-31-2021, 06:11 PM	#4
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,255	Re: Stock Three Hole Cluster ? When I turn the key to the first position I have a oil pressure and generator light. So the other two lights in the fuel gauge on right should be parking brake & temperature ? ...thanks...they have never worked ? __________________ 71 C-20 07 Magnum RT AWD

08-01-2021, 01:27 PM	#6
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,255	Re: Stock Three Hole Cluster ? So the temperature light does not come on in the on position to indicate it’s functional ? Like the gen and oil pressure ? __________________ 71 C-20 07 Magnum RT AWD

08-02-2021, 03:42 PM	#8
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,255	Re: Stock Three Hole Cluster ? Mine do not light up ever ? How can bulbs that only illuminate for a moment burn out ? Guess it’s time to pull the cluster. __________________ 71 C-20 07 Magnum RT AWD

08-02-2021, 04:01 PM	#9
zosoppp Registered User Join Date: Mar 2014 Location: Lincoln Park, NJ Posts: 189	Re: Stock Three Hole Cluster ? If they don't light up, it could be: bad/missing bulbs ignition switch not grounding ignition switch not making the temporary contacts missing/damaged wiring to the ignition switch (dark green for temp, tan for brake) bad/dirty contacts on the panels printed circuit either at the harness plug or at the bulb socket holes. bulbs often blow from the thermal shock of turning on when cold. __________________ 1970 C10 LWB 350SBC, SM330 Muncie (not saginaw SM326) (on tree), 3.07 open (assumed), PS, PB, Idiot lights

08-02-2021, 04:22 PM	#10
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,321	Re: Stock Three Hole Cluster ? You should be able to remove the brake and temperature bulbs from the back of the cluster without removing the cluster from the dash. Attached Images

08-02-2021, 04:28 PM	#11
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,255	Re: Stock Three Hole Cluster ? Thanks fellas for all your help ! I really appreciate the information about the bulbs..Jack __________________ 71 C-20 07 Magnum RT AWD



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