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Advice on intermittent voltage spiking in Jab 3300

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PostPosted: Thu Jul 06, 2017 12:33 pm    Post subject: Advice on intermittent voltage spiking in Jab 3300 Reply with quote

Hi Bob,

One idea that comes to mind is you don't have your engine electrically
bonded to your airframe. On mine this is accomplished by a large copper
braid connected from the engine to the single ground point for the whole
aircraft which is on the firewall. The braid is connected with
significant slack so the vibrations from the engine don't try to break
the bond wire or shake the firewall.


Camas, WA

Zodiac XL, Jab 3300
On 7/6/2017 1:22 PM, Skyking13 wrote:

After a recent catastrophic engine failure I purchased and installed a nearly new (14.6 hour) Gen 3 Jabiru 3300 engine to install in my Arion Lightning LS-1. After installation of the new engine I returned the aircraft to my home base and after about 10 minutes of flight I had a "High Volts" warning on my GRT Sport EFIS. The engine screen showed about 17.9 volts on the bus and battery.
I didn't experience any other problems and landed uneventfully. I then swapped the voltage regulator that was on the aircraft with the one that came with the Jabiru 3300 (same make/model regulator). I was certain that I matched the connections that existed prior to the engine swap when exchanging the regulators. I performed several additional flights testing the new engine and adjusting the prop for best performance but still had some recurring instances of "High Volts". Some of those occurrences happen intermittently during flight and sometimes the "High Volts" light and warnings happen right after takeoff and remain on until power is reduced for landing. Volts seem ok at idle at about 14 but go as high as 18 volts when the warning is illuminated.
I have to confess to having little understanding of wiring, multi testers, and the magic of aircraft electrical systems.
What may be causing this occasionally happening problem with my electrical system. I've checks connections again and again.
Thanks, Captain Bob

Blue Skies & Tailwinds,
Captain Bob

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