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Alternator Connectors

I've got an alternator that occasionally shows on a Garmin EIS a high alternator output on the right side. It shows up for a couple of seconds and then goes back down to normal. It does that once or twice per flight hour. I looked at the connections on the alternator and I noticed some nuts that were wedging the connection on the alternator. It didn't seem like a great way to connect it but it would work. I think this might be a causing the strange alternator outputs. These outputs that go high are at all power settings. Can anyone confirm the connector and nut setup is as designed?

PXL_20231014_214135475.jpg - 2.5 MB

Model: Baron 95-C55
Aircraft Serial Number: TE-242
Posted 10/16/2023 - 4 months ago
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If you look right below the wires and nuts is shows GRD indicating that is a ground terminal. It should not be an issue as long as wires are tight. You have a voltage regulator selector switch on the left sub panel just above pilot's right leg that allows you to select #1 or #2 voltage regulator to operate both alternators.
In your S/N aircraft only one regulator supplies power to both alternators which causes them to provide output to the buss. Try selecting the other regulator and see if it helps with the issue. Beware that the indicators are load meters which show how much the alternator is supplying and not ammeters which show how many amps is being used.
It is not unusual to see different loads on each alternator due to differences in the alternator field resistance.

Bob Ripley
ABS Technical Advisor

Posted 10/16/2023 - 4 months ago
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The raising in alternator amps on the right alternator (one in the photo) shows amps 60 amps+ and sometimes even up to 100 amps for several seconds a few times an hour on the Garmin EIS. It doesn't appear load meter as it reads Amps on the EIS screen.

Posted 10/16/2023 - 4 months ago
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Will;

I have seen this on other Garmin EIS panels, generally traceable to a connection in the shunt wiring. First time I saw it, it was about 380A. Voltage cross-check told me right away I was looking at an indication issue.

Mike
ABS Technical Advisor

Posted 10/16/2023 - 4 months ago
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Is the shunt wiring usually mounted on the firewall of the engine? Hoping to be able to do a general look-over with a local mechanic Thursday and want to know where to start looking with him.

Posted 10/17/2023 - 4 months ago
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Your serial number, according to the 55 WDM (wire diagram manual) originally had direct reading loadmeters. I would say it is doubtful the Shunts are placed in the panel, but you never know. Pull the installation paperwork from your logs for the system; theory is if locations were changed, it should be discussed. If I was installing this system, I would put the shunts immediately aft of the firewall in the normal path the output wire takes, that would be spliced into P30A8; then either P30A8 is re-routed to the circuit breaker, or tied to P32A8 at the old loadmeter connections.

Wiring diagram attached.

Mike
ABS Technical Advisor

attachment

Baron 55_58 Wiring Diagram Manual P_N 96-590010-39.pdf - 32.4 KB

Posted 10/17/2023 - 4 months ago
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Alternator Connectors