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Terry - I'd say the emphasis here is making sure the pins are properly seated, using a gentle wire pull test, into the dsub connectors :)

DanF - if you can remove the antenna without 'disturbing' the paint then I'd do that & cut the 4 x wires, reconnect with male/female 9pin dsub connectors (sans backshells) to the 2020 antenna. You may have enlarge the hole but it will be covered by the antenna anyway & no obvious affect on the...

"Dirty' ripple current from the PM alternator ? Did you install the B&C PM filter unit as I mentioned in a previous post ?

Absolutely ok To do that [ch128521]

Just maybe you were counting from the incorrect end of the dsub - can accidentally happen ;). Been there :D

robint - yes that is what I'm suggesting is a possibility here, it has happened to another poster here. Short version is his mag was bench tested & found to be ok however fitting another mag fixed the problem. Fitting the P-Lead Tach unit may be the most cost effective way of stabilising the tach.

Robin I know of a mag in an IO-540 that had similar problems with one mag but have not seen that in the O-320 (had 2 of those for 20 years) - From my experience you should not have to have wildly different resistors between the 2 mags - I'd pull the LH one & get it checked out. In recent times...

Totally agree Vern.  Although photos were asked for they were not available to see the now obvious part of the problem. It is probably useful to mention now that if you have anything other than a totally aluminum airframe it would be wise to ground the case of most avionics & any seperate...

Bob's situation intrigues me as I've done many avionics installations on composite aircraft like Jabirus & Glasairs but never have had the issues described here. I know the Searey is a very different scenario as the engine is mid mounted pusher & antenna placement options, & access, is...

Any real reason why a blade type transponder antenna can't be used on the bottom up front, eg Comant CI 105, they are sure sturdy enough ?

It would be really helpful to know what type of aircraft (I'm guessing composite) & the exact location of the ELT/COM/Transponder antennas.  Composites are a completely different horse when it comes to 'interference/RF' issues. With the other apparent symptoms you are having I'd be a lot less...

Bob, I'd like to assist you offline -check your pm ;)

From Rev Z page 4-17 (should always read the latest version) -- Power Input "There are two unterminated solid red primary power input wires (to reduce current loading in each wire-these are not for redundancy and both must be connected to the same power source" in other words both wires go to...

What you are seeing at the start Is most likely because the fuel did not touch the sender until you added 1 gal (4litres approx). Same situation as my Glasair ;)

FWIW, & maybe not helpful now that you have a dimmer, however I use the Flight Data Systems LC50 unit For the same sort of situation.

You did WHAT ?  :o Dynon has said many times to NOT do it that way.

If you have a spare TX serial port in the SV then set that to NMEA & connect it to the TT.  The only horizontal hold capability the TT will then have is in HDG mode only, not TRK.  Direct connection from the GPS 250 won't work as the baud rate is far too high. HTH  ;)

Richard, it's all to do with the Altitude bug - set it to zero if you don't want the warnings, I find the Alt bug to be a neat useful feature. ;)

An easy check, simple least amount of work first, would be to - 1. disconnect the disconnect wire at the roll servo - if that doesn't work then - 2. also do the same with the Pitch servo leaving the roll disconnected 3. Let us know if the above doesn't 'fix' the issue ;)

Hopefully that's possible ;)