Voltage Regulator Failure

Good thought, Mike.  Ross, is this a UL/ULS engine, or an iS?

If it's an iS, there's another possibility that might explain the minimal load capacity: loss of one phase of the stator feed.  Perhaps a pin/socket backed out of a connector body or one rectifier diode failed open?

Thanks guys

2016 912 ULS,

No strobes running, but charging for IPad, Stratus, and lithium iron batt.

Going to do the testing suggested with a multi meter and check connections.

CARMO CMM5005.

Fitting straight forward BE SURE THAT ALL CONNECTIONS ARE GOOD & TIGHT. I left my Capacitor in place , not connected.

Have about 2 Hobbs hrs now. Works great. Long may it do so.

Performance (sorry, from imperfect memory)

Directly after start; 14 V 10 amps

Pre T-O Runup; 14.2 V 3 amps. Temperature 40C

Some time later in Cruise: 14.2 V 1 amp. Temperature 36C (Note; The VR has a dedicated cool air supply)

😈

I have a Remos G3 from 2003 with the Rotax 912ULS fitted with the Ignitec ignition modules. The Ducati regulator failed and I decided to change to litium battery. The choice was AIRBATT Starting Power LPB 5900 4A2P 12V 5.0 Ah LiFePO4 Starter Battery with the CARMO CARR5115 regulator. Just looked to be a lean and fine option, 5 wires, 2 for generator, 2 for the battery and 1 for the charger light indicator.

I fitted all and did the ground test run, all fine. Went for a flight with the wife. Climber out to 2500 feet an after apprx 5 min then suddenly the engine at 4200 rpm made some rough cut outs, by reducing to 3900 rpm the engine then again was running fine. Decided to return immidiately to the airfield. Did some further ground test runs and I could repeat the situation. 

Contacted both Carmo and Ignitech, but they could not give any explanation. My considerations, the ignition and the charger system is 2 separate systems, so how can this happen ?

Carmo is saying more Rotax 912 are flyving around with the CARR5115 regulator, but they offered a full refund on return of the item.

Changed to the AIRBATT GR10 OVP 12V Lead/LiFePO4 Generator regulator and have not had problems since.

Just some experience from my side.

Speculative Comment:

I can not see how the voltage regulator is connect, has an influence, on the engine ignition system????😈