Powering Gauges With a Relay - Team Camaro Tech
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post #1 of 9 (permalink) Old Jan 7th, 13, 12:45 PM Thread Starter
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Al
 
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Powering Gauges With a Relay

Apologies up front for the long post.

Autometer 4 gauge console pod. I'm in the process of moving my fuel gauge from the console to the center pod of the dash and installing a voltmeter where the fuel gauge was. The voltmeter is installed and reads about a volt lower than what I measure at the battery, which I suppose is to be expected considering the length/condition of the wiring before it finally gets to the gauge.

My batt is trunk mounted with a 1/0 cable going to a bulkhead connector under the heater box. My thought is to trigger a relay from the ACC spade and power the gauges with a very short run of 12 AWG wire from the bulkhead connector to the gauge pod which should give me a much more accurate reading of batt voltage on the voltmeter.

Something about being reminded of voltage drop every time I look at the voltmeter I guess.

Am I crazy?


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post #2 of 9 (permalink) Old Jan 7th, 13, 12:46 PM
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Re: Powering Gauges With a Relay

yes

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post #3 of 9 (permalink) Old Jan 7th, 13, 01:22 PM
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Re: Powering Gauges With a Relay

I would try to figure out where your voltgage drop is. Bad connection / wire.

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post #4 of 9 (permalink) Old Jan 7th, 13, 01:24 PM
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Re: Powering Gauges With a Relay

Just take a pencil and write the correct numbers on the gauge- problem solved!
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post #5 of 9 (permalink) Old Jan 7th, 13, 01:47 PM
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Re: Powering Gauges With a Relay

So it reads a volt lower. What's the problem?

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post #6 of 9 (permalink) Old Jan 7th, 13, 02:46 PM
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Re: Powering Gauges With a Relay

Maybe the gauge. Run a test wire to see before you go to the trouble. I have a cheapie gauge in my '67 and it reads .75 volts high.

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post #7 of 9 (permalink) Old Jan 7th, 13, 06:31 PM
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Re: Powering Gauges With a Relay

Reads like a good idea, and yes, there will be some line loss, er, voltage drop.
There might be a removable plug on the back of the gauge to calibrate it.
Use the DMM and adjust the voltmeter to read the same.

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post #8 of 9 (permalink) Old Jan 19th, 13, 12:10 AM Thread Starter
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Re: Powering Gauges With a Relay

I finished this project today - fairly simple. The voltmeter now reads battery voltage with the engine off/key on and shows accurate charge voltage with the engine running. Added bonus - no deflection of the needle on the voltmeter when the turn signals are flashing which drove me nuts. Call me crazy.


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post #9 of 9 (permalink) Old Jan 19th, 13, 09:46 AM
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Re: Powering Gauges With a Relay

Got pics?

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