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Subject: Garmin G900X erratic EGTs
From: Clark Baker <bakercdb@gmail.com>
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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I have a Garmin G900X in my Legacy. I have erratic EGT readings on all 6
(in flight)   They read around 100F low and are erratic in an about 200F
range.

All other temps and reading are fine.

The problem goes away completely when I shut off both alternators.
(Shutting off one does not do anything).  No other electrical items have
any effect

Note-shutting the alternators off does Not have any  effect on the
stormscope or radio noise (there is none)

We replaced the GEA engine interface box. We replaced all EGT senders and
completely redid all EGT wiring from probe to panel. We used thermocouple
connectors. We added a second engine ground strap. We checked all grounds.

I do Not get any radio noise and reception is great. The WX500 is clear out
to 75 miles.

Garmin has not been much help. Has anyone encountered this or have any
suggestions?  We are at a loss.

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<p>I have a Garmin G900X in my Legacy. I have erratic EGT readings on all 6=
 (in flight)=A0=A0 They read around 100F low and are erratic in an about 20=
0F range. </p>
<p>All other temps and reading are fine.</p>
<p>The problem goes away completely when I shut off both alternators. (Shut=
ting off one does not do anything).=A0 No other electrical items have any e=
ffect </p>
<p>Note-shutting the alternators off does Not have any=A0 effect on the sto=
rmscope or radio noise (there is none)=A0 </p>
<p>We replaced the GEA engine interface box. We replaced all EGT senders an=
d completely redid all EGT wiring from probe to panel. We used thermocouple=
 connectors. We added a second engine ground strap. We checked all grounds.=
</p>

<p>I do Not get any radio noise and reception is great. The WX500 is clear =
out to 75 miles.<br></p>
<p>Garmin has not been much help. Has anyone encountered this or have any s=
uggestions?=A0 We are at a loss. </p>

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