68 Console Fuel Gauge Electronics - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 12th, 04, 06:44 AM Thread Starter
 
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Lightbulb

Does anyone out here have a schematic that goes to the component level for the little black unit that turns on the low fuel gauge light on the speedo?
$60.00 USD is pretty steep for $10.00 worth of componets. I would perfer to repair mine if possible. Any help would be appreciated.

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post #2 of 8 (permalink) Old Mar 12th, 04, 10:06 AM
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The components are probably less than that but I never have been able to find anyone that could cross reference auto makers component numbers with standard available ones.

Ron
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post #3 of 8 (permalink) Old Mar 12th, 04, 10:36 AM Thread Starter
 
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Ya. And I can't even read mine to try and make the attempt myself.
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post #4 of 8 (permalink) Old Mar 12th, 04, 01:04 PM
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If you're a electronics hacker look at circuits that turn an op-amp into a comparator. Basically it is an op-amp circuit with both positive and negative feedback. You set it so when the fuel guage signal is near empty the thing will trip and light the light. The positive feedback gives it hysteresis so the light doesn't blink on and off near empty.

Dave
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post #5 of 8 (permalink) Old Mar 16th, 04, 10:36 AM Thread Starter
 
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Thanks Dave. You've got the brain juices flowing now. [img]graemlins/hurray.gif[/img]
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post #6 of 8 (permalink) Old Mar 16th, 04, 01:58 PM
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If it had feedback that would be a great improvement over stock. Mine flashes like a signal at train track crossings when I get near empty. Every turn and bump will switch it on and off as the gas schloshes back and forth, from about 4 gallons left until it gets to about 2 gallons left when it finally stays on for good.

Mark Canning
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post #7 of 8 (permalink) Old Mar 18th, 04, 06:29 AM Thread Starter
 
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That's better then me. Mine was stuck on all the time.
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post #8 of 8 (permalink) Old Mar 18th, 04, 09:07 AM
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Classic Muscle lists a unit that is "adjustable". There are other posts on the subject that talk about a "reed switch" in the unit.

I am going to replace mine as soon as I am sure it is bad. I know that the dash light works when it is grounded. And I know that the dash light does not come on when the tank sender is grounded at the back of the console gage. Grounding the tank sender wire should trigger the module to turn the dash light on, right?

Gary

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