Pyro / Trans gauges have me stumped - Ford Powerstroke Diesel Forum
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Old 09-03-2013, 01:57 PM
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Pyro / Trans gauges have me stumped

Problem: Both trans and pyro gauge will not read anything at all.

Things I have checked:
1. Lighting is fine because it operates flawlessly with the dimmer switch.
2. I'm getting 12v power at the gauge from the key on power source.
3. Ground wire at gauge connections also works as they should.

Possible problems?:
1. I bought two bad gauges. (doubtful)
2. I have two bad thermocouple's?
3. Faulty wires between gauge and thermocouples?
4. Any combination of the above.

I'm about as far as my electrical proficiency will get and I am open to any suggestions on any things to check or methods on how to check the possible problems listed.
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Old 09-03-2013, 02:03 PM
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Send a message via AIM to Raul@Stealth Automotive
what brand gauges?
new or used?
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Old 09-03-2013, 04:12 PM
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Autometer gs
New
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Old 09-03-2013, 04:32 PM
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With both being bad, and having power, I will guess it's faulty wiring to the probes. Double check all of that, redo connections anyway, just to be sure.
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Old 09-03-2013, 04:58 PM
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It's always usually ground. How did you do the grounds?
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Old 09-03-2013, 05:07 PM
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Jesilvas: The pyro has a connector that plugs into the back which contains all of the wires. I checked the ground by disconnecting the plug and using the pin connected to the ground wire as the ground then checked both 12v power sources which gave me a 12v reading. I assume the meter wouldn't give me the 12v reading if the ground connection wasn't grounded.

The trans temp has individual connectors that slide on. I pulled those and checked the same as above.

I connected the grounds under the dash to the ground wires/screws already there.
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Old 09-03-2013, 05:17 PM
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I pulled the pyro connector and started the truck to see if I could somehow tell if the probe was working or not.

I used the multimeter and touched a lead to one of the two wires then the other to either the 12v source or the ground, I got these readings.

Red wire to 12v: 0.185v
Yellow wire to 12v: 1.050
Yellow to ground: .018 and slowly went down to .016 (I stopped at .016)
Red to ground: .001 (also read .002 and .000)

I don't know if that test accomplished anything, but I'm assuming that the yellow to ground might indicate the probe reading a rise in temp.
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