Amp reading

Allan Stern · #1 03-10-2020, 10:35 AM

I am not reading any amps on my GX3 engine screen. I do have voltage. Could someone provide me with how you wired up your shunt? I think it is wired up correctly but I want to see how others wired it in.

I put the shunt in between the alternator wire and the wire going into the avionics buss. With two wires screwed onto the top of the shunt.

Thanks

pilot2512 · #2 03-10-2020, 10:46 AM

I hate to ask the obvious...but if it is in the alternator wire then the engine must be running and the alternator working to read amps. Also there is supposed to be fuses between the shunt and GEA 24.

Jay

Allan Stern · #3 03-10-2020, 01:48 PM

No fuses between shunt. According to Stein, I do have it wired properly so he is investigating. Might be a setting issue on G3X as it was with volts.

g3xpert · #4 03-10-2020, 03:14 PM

Quote:

Originally Posted by Allan Stern

I am not reading any amps on my GX3 engine screen. I do have voltage. Could someone provide me with how you wired up your shunt? I think it is wired up correctly but I want to see how others wired it in.

I put the shunt in between the alternator wire and the wire going into the avionics buss. With two wires screwed onto the top of the shunt.

Thanks

Allan,

This is the wiring diagram for interfacing a shunt to the GEA 24:

There are fuses installed in line with the sense wires.

It sounds like the purpose of this shunt is to measure alternator output? What configuration setting are you using for the shunt input?

Thanks,

Justin

Boyd Birchler · #5 03-10-2020, 06:25 PM

Mine read "0" until the engine was running. Then read system load the rest of the time while flying. I just now (45 minutes ago) finnished my second hour with my new panel.

Jpm757 · #6 03-10-2020, 07:15 PM

Just finished an RV8 panel with a Stein harness, FWIW, the blue/white wire from the GEA24 is attached to the battery side of the shunt.

Allan Stern · #7 03-14-2020, 11:03 AM

I would like to thank everyone that has answered my post and gave me some great suggestions to look at. I did a lot of investigation and took all suggestions to heart and had an had a brain fart to discover the reason why.

Mea Culpa, it was my fault and admit to a greivous error. I discovered that I was not turning the master switch all the way on to turn on the alternator/master after I started the engine. Was only turning on the battery to start it.

It now works fine and I feel a tad stupid for it, but will admit I was at fault.

Thanks for the help.

Yank · #8 03-14-2020, 09:18 PM

Hey, that’s what is so great about this group....everyone learns

MCA · #9 03-15-2020, 11:39 PM

Hey Allen, I'm all for starting the engine with the alternator turned off. IMO there's no reason to have it on during start. Just gotta remember to turn it on after start

Marc

mfleming · #10 04-06-2023, 11:44 AM

Allen found his problem but I haven’t.

I have a Dynon shunt (60a/60Mv) in line with the alternator B lead, wired per Garmin drawings for my GEA24.

No amperage indicated when the is engine running, volts look good.

I checked the continuity between the shunt and the GEA24 pins, no blown fuses.

On the config page, I have alternator selected but am unsure what to set the scale factor to on the config page, the default is 1.0.

Any thoughts on why this might be happening?