Forums

[orchidman]

Rob,
When the engine is an injected engine, no Carb Temp probe is supplied.

However the wires are populated. Do you recommend cutting the wires at the shrink tubing at the back of the connector shell, or open the shell and remove the pins from the connector, or ????

Gary
_________________
Gary Blankenbiller
RV-10 Flying

[rshannon]

Gary, There are several wires I'm not using either. In every case, however, I've left the pins in place, and brought the wires out far enough that I can get at them and splice into them in the future without becoming an extreme pretzel. For my panel, that usually means a length of at least 2 ft. For wires that may need to be FWF (carb temp, second ammeter, etc.) I run them out there in the thru-FW bundle anyway. In the case of the EFIS, I have even added pins & wires (backup power, etc.) only to terminate them for now. In my case, in the future, it will be easier to reach up for a stubbed off wire and splice into it -- than it would be to pull the plug, open the hood, install a new pin and wire, reseal the hood, and re-bundle (or "over" bundle) the existing collection.

To terminate all unused wires (whether from the EFIS or elsewhere) I cover the end with about 1-1/4" of tight fit heat shrink, with half of that extending loose off the wire end. After shrinking, I bend the loose, shrunk end back alongside the wire, and cover that bent back heat shrink with a short piece of the next size heat shrink. I leave about 1/8" of the second "binder" shrink tubing extending over the wire end, to act as a chafe "bumper" for the inner folded piece. The result is a well-insulated, relatively moisture proof termination.

After wires are terminated in this fashion, I fold them back out of the way but still in reach, try to make sure the stub end is pointed up so as not to collect condensation, make sure they're labeled, and secure them with silicon tape, tie wraps, etc. Finally, I make a note of the location of terminated "dead ends" in a spreadsheet to help find them in the future.

I've been rather religious about this termination technique, on the theory that you never know when that wire might be live, or touch a live wire, whether hot with high current, or just low level data signals. I even break out multi-conductor cable, like unused serial wires, and terminate each one of them individually. Overdone? Probably, but I'll have fewer suspects to worry about if there's a problem down the road.

More detail than you want or need, no doubt, but perhaps it will give somebody a useful idea of what to do... or not do!
_________________
Ron
Murphy Rebel / Jabiru 3300
Dual AF-3400EE/EF+AOA
http://n254mr.com

[orchidman]

[Noah]

Am planning one or two auxiliary temp sensors firewall forward as fire sensors. Searched the archives and this is the closest thread.

1. Can the Carb temp be used on an IO engine for this purpose?
2. Goal is to alarm on sensor overtemp. Can this be user reconfigured in GUI to NOT be carb temp?
3. CHT/EGT harness drawing 53847WD R2 has pins 1-5 & 14-17 unused. Can these be used for aux temp inputs and alarmed similarly?
4. Where can I find a drawing of this connector's pinout on the back of the 4500 - its not in the manual as far as I can tell.

Thanks!
_________________
Noah
RV-7A Finishing
Saunderstown, RI

[rshannon]

If I understand your questions correctly....