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  #11  
Old 06-18-2013, 06:25 PM
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Thanks for the reply Matt. I am using the wiring schematic from Steinair. They have the correct wire colors on their schematic that match the GTP 59 wire colors. The G3X installation manual has the yellow wire as the power wire for connector P732, pin 16, (though the connector that I have is J732) on Appendix C, page C-4, revision G. I just checked once again to be positive the wiring and pins are correct and they are. I also checked the GTP 59 wires with an ohm meter disconnected from the GSU 73:
Wht-Blue: .3
Wht-Orange: 539

Blue-Wht: .4
Blue-Orange: 540

Orange-wht: 539
Orange-blue: 539

There is 4.98 volts coming out of the GSU 73 female connector J732 pin socket #16. I am getting correct EGT and CHT readings.
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Last edited by 9GT : 06-18-2013 at 06:29 PM.
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  #12  
Old 06-19-2013, 02:26 AM
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Matt,

The resistance in the leads are as You specify (measured at the pins).

Next I carefully opened the cable about a foot from P732 connector, pulled out blue and orange lead, powered on and measured 87.6 mV between them.

What to do next?

/Fredrik
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  #13  
Old 06-19-2013, 08:19 AM
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Post GSU73 OAT Input Tester

Fredrik and David,

If you wanted to test the GSU73 OAT probe interface, you could build a quick OAT tester like I did this morning.



I took a 550 ohm resistor (anything around 500 ohms will do), soldered two wires on one end and one wire on the other end.

Insert the two wires on one end of the resistor into pins 15 and 16 on the P732 connector and plug the single wire on the other end of the resistor into pin 35 on the P732 connector. If you leave the connections un-insulated like this, make sure nothing is shorted to ground before applying power to the system.

I went from a red-x'd OAT reading (with nothing plugged into pins 15,16,35) to everything OK reading a steady 76 degs F on the PFD in just a couple of seconds after turn on.

Hope this helps.

Thanks,
Steve
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Last edited by g3xpert : 06-19-2013 at 08:25 AM. Reason: Added note about insulation.
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  #14  
Old 06-19-2013, 09:22 AM
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Hi Steve,

Thanks for Your suggestion.
I made up a fake probe according to Your description and tested it.

Still got a red X.

/Fredrik
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  #15  
Old 06-19-2013, 09:23 AM
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Quote:
Originally Posted by g3xpert View Post
Fredrik and David,

If you wanted to test the GSU73 OAT probe interface, you could build a quick OAT tester like I did this morning.

I took a 550 ohm resistor (anything around 500 ohms will do), soldered two wires on one end and one wire on the other end.

Insert the two wires on one end of the resistor into pins 15 and 16 on the P732 connector and plug the single wire on the other end of the resistor into pin 35 on the P732 connector. If you leave the connections un-insulated like this, make sure nothing is shorted to ground before applying power to the system.

I went from a red-x'd OAT reading (with nothing plugged into pins 15,16,35) to everything OK reading a steady 76 degs F on the PFD in just a couple of seconds after turn on.

Hope this helps.

Thanks,
Steve
Thanks Steve. I will do this when I get back home Friday.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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  #16  
Old 06-19-2013, 11:12 AM
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Fredrik and David,

We sent you emails, but not sure you received them.

Please email us at the address below so we can work with you directly to get this resolved quickly.

Thanks,
Steve
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1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
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  #17  
Old 06-19-2013, 12:08 PM
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Ok!

changing to email.

/Fredrik
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  #18  
Old 06-19-2013, 02:56 PM
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This issue was solved by software downgrade (7.40), configuration and then back to software v. 8.00.

Thanks to G3X support!

Cheers,
Fredrik
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  #19  
Old 06-19-2013, 07:48 PM
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Quote:
Originally Posted by g3xpert View Post
Fredrik and David,

We sent you emails, but not sure you received them.

Please email us at the address below so we can work with you directly to get this resolved quickly.

Thanks,
Steve
I sent you an email with current address. Thanks Steve.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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