What is there to fail on an isspro pyro? I have power to the "black box", but I mounted it by the master cyl. and it looks like it gets warm there; the sticker is bubbled a bit on it. I need this fixed before I smoke the poor old girl

 

I've had to replace 2 thermocouples on mine. Also check the ground

 

Problem I see most often is a loose connection where the pigtail from the sensor joins the wiring.
Isspro is very good about replacing defective gauges for free.

 

I've had my Isspro pyro for almost ten years now, never had a problem. I did have a problem with my Isspro transmission temp guage, the wires came loose at the box, which is under the dash.

 

what about all the trucks out there that don't have any gauges at all? do you think they are in danger of getting "smoked"?....just curious


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Pyrometer Gauge
Check Thermocouple Output
1. With power off disconnect thermocouple leads from wire harness that goes to amplifier box.
2. Using a multimeter on the resistance setting check thermocouple resistance at the red and yellow wire. Resistance should less then 1Ω.
3. With the multimeter still connected, move the thermocouple wire harness.
Resistance should still be less then 1Ω. If resistance measures higher then 1Ω this could be the problem.
4. Using a multimeter on the millivolt setting check thermocouple output.
5. Make sure the thermocouple is at room temperature
6. This is the output for the thermocouple.
7. If the thermocouple output is at 1mV or less then start the engine and check to see if the thermocouple output increases.
8. Use the thermocouple output chart to see if the thermocouple output matches the temperature of the manifold or exhaust pipe.
9. If mutlimeter measures a low output the thermocouple could have a problem.
Check Gauge Resistance
1. With power off disconnect the four wire connector from wire harness that goes to amplifier box
2. Check wires on studs to make sure wire colors match labels on studs.
Green (GN) and Yellow (Y) and Gray (GY) and White (W)
3. Using a multimeter on the resistance setting check gauge resistance.
4. Connect multimeter leads across studs label green (GN) and yellow (Y).
Resistance should measure around 82Ω
5. Connect multimeter leads across studs label gray (GY) and white (W).
Resistance should measure around 75Ω
6. If mutlimeter measures open in either pair the gauge could have a problem.
Check Amplifier Box
1. With power off disconnect thermocouple leads from wire harness that goes to amplifier box.
2. Make sure the four wire connector going to the gauge is connected.
3. Turn power to gauge on.
4. Using a multimeter on the voltage setting check voltage at the gauge.
Green(+)/Yellow(-)
Thermocouple Output
Gray(+)/White(-)
2.5 Volts
Open
0.8 Volts
#
2.0 Volts
300°F
2.2 Volts
#
-.9 Volts
600°F
2.5 Volts
# Connect thermocouple for this measurement

 

I have been harvesting grain for a while and haven't been here to read this; THANK YOU!! The amount of GOOD info on DTR blows me away!!