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Old 01-03-2014, 01:54 AM   #21
koates
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

Hi there, If you read the specifications of those two types of ceramic resistors supplied by various auto houses you will note they are suitable for very specific current draw ranges. One from 2 to 4 amps draw and the other 4 to 6amps draw. Ceramic resistors cannot REGULATE the voltage, they only lower it depending on the current draw of the load being fed. Your gauges require a voltage REDUCED from 12 volts to 6 volts and the voltage to be REGULATED at 6 volts regardless of other loads turned on and off (lights,wipers,heater fan etc) in your vehicle. The requirement for a 6 volt regulated supply is to achieve consistent accuracy readings on your gauges regardless of outside voltage variations. I would not use a runtz on my gauges. Use a single reducer/regulator to supply all three gauges. Macs have one ,part # V12871, same one is also supplied by Dennis Carpenter. OR you can google "Voltage Reducers 12 to 6 volts" on ebay. You need about a 2 to 3 amps capable unit. There are many on here from as low as $3.00 each. That is the best and only way to go. Ceramic resistors are only good for heater fans, w/wiper motors, horns, valve radios etc where a specific current draw of the item can be established..and that way the resistance value in ohms of the resistor can be worked out. Hope this helps you. Regards, Kevin.
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Old 01-03-2014, 02:51 AM   #22
Mike B
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

Good info on the ceramics Kevin (and other info) thanks (to all as well) again
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Old 01-03-2014, 08:56 AM   #23
Barry-ct
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

Ford number was B9AZ 10804-A
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Old 01-03-2014, 09:13 AM   #24
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

I bought the regulator type from Dennis Carpenter that reduces the fuel,temp and oil pressure gauges. If I remember correctly paid about $30. Installed a 5 amp fuse on the hot wire.
Have not tested it yet. Any reviews on this reducer?
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Old 01-03-2014, 02:13 PM   #25
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

Mike B , I built a solid state voltage reducer from radio shack parts, cost about 18.00 bucks, found the plan on a ford truck site, I still have it somewhere, PM me if you need.
Anyhow, it's in a 51 f1 12volt running all three stock guages without fail for three years so far, driven daily. I futzed with the a few IVR ford parts from napa and original, never liked em, the gauges aren't steady, you can put a meter on em and watch the voltage jump all over the place..
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Old 01-03-2014, 02:21 PM   #26
Mike B
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

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I think I know what circuit you're speaking of Pineapple...L7806, two caps and a diode? or something different?

Thanks
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Old 01-03-2014, 03:54 PM   #27
Ross F-1
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

Is it this one?
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File Type: jpg LM gauge Circuit.jpg (37.4 KB, 34 views)
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Old 01-03-2014, 04:57 PM   #28
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

I gotta go dig it up.. Gimme a few minutes.
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Old 01-03-2014, 05:15 PM   #29
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

Here is the link to the thread I found it on...

http://www.ford-trucks.com/forums/79...tage-unit.html

This is what he wrote, and I printed..

You could spend around 5.00 and build it yourself.
all you need is
1 - 276-1770a 5vdc regulator
1 - 276-1368 heat sink
1 - 272 1025 10mf capacitor

Radio shack sells all these components.
the transistor regulator has 3 pins on it 1 is the input voltage
2 is for the ground and 3 is the output voltage.
Soilder the capacitor on pin 1 and 2 the arrow on the cap is the negative that goes to the middle ground pin and the other soilders to the incoming power pin 1.
the output pin 3 goes to your existing gauge pin from your old cvr and the incoming 12vdc that was on the line side of your old cvr goes to pin 1.
Done! Now you have a rock steady 5vdc source. make sure to use shrink tube on pins 1 ndd 3 and fasten the heat sink in place of your old cvr.

There was no diagram as it turns out..I'll post a picture on the next post..
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Old 01-03-2014, 05:27 PM   #30
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Default Re: Why won't the 12v to 6v ceramic reducers work for gauges?

Here's a pic of one I broke by being a knuckledragger, along with the paper printout from the thread I found it on..There's a pic of one on the thread as well.

I will build one of these for every ford gauge setup I use in the future, It just works perfectly..

Hope this helps.

Matt.
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