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EMS: Amps Reading


schurch379

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Posted

I bought a 2007 CTLS in 2012. I have flown it all over the Hawaiian islands. It is well maintained and hangered.

One thing I have constantly noticed is that ( on the EMS display ) the amperage reading fluctuates almost second to second all over the place--usually, from -8amps to +10 amps. The voltage reading fluctuates just a little bit, almost always in the 12.8V to 13.2V range. The fluctuation on the amp reading is much small when the engine is at taxing rpms ( & always in the green ), but at 5,200rpm cruise it bounces around almost second to second.

And occasionally if the amp reading bounced to -10amps or so---into the red, the red engine light would come on. This is a little bothersome when flying over the ocean, and caused a little worry with my wife today. The engine runs just great, and there are no other issues, but I thought I better ask more knowledgeable people--like you all, what you thought of this...???

Would appreciate your thoughts on this....

Thanks.

Scott
Kona Hawaii
FDN992SA

Posted

Check your ground connections first. Next check the capacitor to make sure a wire is not disconnected or broken. After those I would start checking other electrical connections starting at the voltage regulator.

Posted

Installing a 100k capacitor that chanik recommended dramatically decreases ammeter bounce.

 

And it's the terrible regulator rectifiers that are noisy. The power coming off the coils will be pretty clean.

Posted

Scott, CPS' System Manager emailed me with a message for you:

 

“Scott,
This sounds like a loose ground wire. I would check all the ground connections and see if this fixes the problem.
-Bryan”

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