Unexpected dash warning light illumination - Team Camaro Tech
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post #1 of 13 (permalink) Old Oct 25th, 12, 05:30 AM Thread Starter
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Unexpected dash warning light illumination

Last night while running an errand, the dash warning lamps for temp, generator and fuel all unexpectedly came on. The car had only been running for three mins, so it wasn't overheating, the fuel gauge still displayed a correct level, and as near as I could tell from visual indicators ie dim dashlights/headlights, the system wasn't discharging. The car has console gauges with the low fuel sender, new American Autowire harnesses, and I have wired in the temp light on the dash to work as a back-up to the temp gauge. The wire to the coolant sensor in the cylinder heads was not hooked up as the sender does not have the correct resistance to accurately run the gauge and light in tandem. I haven't gotten around to installing two separate sensors, but that's a job for another day. Anyone seen this before or have any suggestions?
Thanks
Todd

69 Camaro, 384, AFR 195 Eliminators, Jessel shaft rockers, Comp hyd roller, 545/555, 230/236 @ .050, 110 LSA, Dynatech, Eagle forged rotating assembly, 74 L82 block, factory Z-28 intake, MSD digital ignition, 10.25 compression, 3:73 12 bolt, RS500.
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post #2 of 13 (permalink) Old Oct 25th, 12, 06:17 AM
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Re: unexpected dash warning light illumination

Voltage Regulator should be tested and check the connection harness.


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post #3 of 13 (permalink) Old Oct 25th, 12, 02:13 PM Thread Starter
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Re: Unexpected dash warning light illumination

Swapped in a regulator I had lying around and checked the connections. No change. Still scratching my head.

69 Camaro, 384, AFR 195 Eliminators, Jessel shaft rockers, Comp hyd roller, 545/555, 230/236 @ .050, 110 LSA, Dynatech, Eagle forged rotating assembly, 74 L82 block, factory Z-28 intake, MSD digital ignition, 10.25 compression, 3:73 12 bolt, RS500.
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post #4 of 13 (permalink) Old Oct 25th, 12, 02:35 PM
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Re: Unexpected dash warning light illumination

I'm not sure how you wired the light and guage together for the temp. I would run them as two seperate circuits except for the hot(ign) wire. With that said is it possible the wire that is supposed to go to the sender is grounded underhood by laying on a hot manifold or something?

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post #5 of 13 (permalink) Old Oct 25th, 12, 06:38 PM Thread Starter
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Re: Unexpected dash warning light illumination

I thought about that, but when I checked it, no dice. I have a feeling I'm going to have to dig for this one.

69 Camaro, 384, AFR 195 Eliminators, Jessel shaft rockers, Comp hyd roller, 545/555, 230/236 @ .050, 110 LSA, Dynatech, Eagle forged rotating assembly, 74 L82 block, factory Z-28 intake, MSD digital ignition, 10.25 compression, 3:73 12 bolt, RS500.
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post #6 of 13 (permalink) Old Oct 26th, 12, 04:24 AM
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Re: Unexpected dash warning light illumination

As Jeff suggests, temp light needs its own temp switch and temp gauge needs its own temp sensor. The two circuits should never be connected together other than input power.

If GEN light came on, and the charging system is equipped with an external regulator, alternator terminal R supplies VR relay voltage thus turning off the GEN light. No voltage, GEN light on.

Have you measured:
1. alternator BATT stud voltage to ground? Should not be less than 13.8 volts at 2000 rpm.
2. Voltage across battery posts? Should not be less than 13.5 volts at 2000 rpm.
If above measurements are battery voltage, and the VR has been changed, then alt could be bad, or belt slipping.

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post #7 of 13 (permalink) Old Oct 26th, 12, 08:36 PM
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Re: Unexpected dash warning light illumination

I would check the cluster ground first.
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post #8 of 13 (permalink) Old Oct 27th, 12, 12:30 PM Thread Starter
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Re: Unexpected dash warning light illumination

Hmmm. Gauge fuse was blown and instantly blows when replacement is installed. Dead short somewhere.

69 Camaro, 384, AFR 195 Eliminators, Jessel shaft rockers, Comp hyd roller, 545/555, 230/236 @ .050, 110 LSA, Dynatech, Eagle forged rotating assembly, 74 L82 block, factory Z-28 intake, MSD digital ignition, 10.25 compression, 3:73 12 bolt, RS500.
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post #9 of 13 (permalink) Old Oct 27th, 12, 05:38 PM
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Re: Unexpected dash warning light illumination

Buy a couple boxes of fuses. Unplug console harness and see if fuse blows.
If it does not, then disconnect each gauge input power, pink wire, by itself and insert new fuse.
The previous circuit opened from no fuse blown is the faulty circuit.
If fuse blows with console disconnected, go from fuse panel to pink wire. should be an open to ground when measure with an ohmmeter.
Could also be a shorted warning bulb. Easy enough to check.

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post #10 of 13 (permalink) Old Oct 29th, 12, 01:51 PM Thread Starter
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Re: Unexpected dash warning light illumination

I unplugged the console and the temp and fuel warning lights went out, however, the generator light stayed on. Replaced the fuse and it still instantly blows. Voltage at the battery is 12.9, and at the batt post on the alt it reads the same.

69 Camaro, 384, AFR 195 Eliminators, Jessel shaft rockers, Comp hyd roller, 545/555, 230/236 @ .050, 110 LSA, Dynatech, Eagle forged rotating assembly, 74 L82 block, factory Z-28 intake, MSD digital ignition, 10.25 compression, 3:73 12 bolt, RS500.
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post #11 of 13 (permalink) Old Oct 29th, 12, 02:48 PM Thread Starter
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Re: Unexpected dash warning light illumination

Voltage measured across the battery with the car running is 18 Volts DC. Seems pretty high. Too high?

69 Camaro, 384, AFR 195 Eliminators, Jessel shaft rockers, Comp hyd roller, 545/555, 230/236 @ .050, 110 LSA, Dynatech, Eagle forged rotating assembly, 74 L82 block, factory Z-28 intake, MSD digital ignition, 10.25 compression, 3:73 12 bolt, RS500.
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post #12 of 13 (permalink) Old Oct 29th, 12, 03:05 PM
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Re: Unexpected dash warning light illumination

Yes, too high. You might try an electronic VR, Wells P/N VR715.

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post #13 of 13 (permalink) Old Oct 30th, 12, 05:15 AM
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Re: Unexpected dash warning light illumination

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Originally Posted by lt14spd View Post
Last night while running an errand, the dash warning lamps for temp, generator and fuel all unexpectedly came on. The car had only been running for three mins, so it wasn't overheating, the fuel gauge still displayed a correct level, and as near as I could tell from visual indicators ie dim dashlights/headlights, the system wasn't discharging. The car has console gauges with the low fuel sender, new American Autowire harnesses, and I have wired in the temp light on the dash to work as a back-up to the temp gauge. The wire to the coolant sensor in the cylinder heads was not hooked up as the sender does not have the correct resistance to accurately run the gauge and light in tandem. I haven't gotten around to installing two separate sensors, but that's a job for another day. Anyone seen this before or have any suggestions?
Thanks
Todd
Have you ever used led lights as dash lights?
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