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EMS Ground vs Aircraft Ground after connection of ground bundles

  • Bryan Casper
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3 weeks 1 day ago - 3 weeks 1 day ago #17385 by Bryan Casper
Bryan Casper created the topic: EMS Ground vs Aircraft Ground after connection of ground bundles
I'm installing the ground wiring on my 912iS Sport. I am attempting to determine where each of the cable bundle of ground lines from both of the wiring harnesses labeled "Regulator A" and "Regulator B" should be connected. Based on the picture, both of the "bundle of ground lines" from both wiring harnesses should be connected to the studs of Regulator A's EMS ground. However, the written instructions don't address explicitly where the ground bundle coming from Regular B's wiring bundle should be connected. Here are the instructions as listed in the installation manual:

The EMS grounding cables of the wiring harness (labelled: "Regulator A“ or cables with cable lugs) must be connected to the 3 attachment points of the EMS ground (Regulator A). Each cable bundle of ground lines from the wiring harness has to be connected to one of the free fixing points. EMS ground has 3 interconnected ground connections which may be used interchangeably.

Airframe ground (Regulator B ) also has 3 interconnected ground connections which may be used interchangeably, one of which must be connected to the airframe ground.


Any advice?
Last Edit: 3 weeks 1 day ago by Bryan Casper.

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3 weeks 1 day ago - 3 weeks 1 day ago #17387 by Bill Hertzel
Bill Hertzel replied the topic: EMS Ground vs Aircraft Ground after connection of ground bundles
Look at the picture on the same page as your quote.
Both of the ground bundles LaneA and LaneB coming from The FuseBox Harness Connectors X1 and X2 attach to the REGULATOR "A" (EMS) GROUND Points.
There should be two bundles. One with 4 Ring Lugs and another with 5 ring lugs for a total of 9. All 9 go to the Regulator "A" (EMS) Ground.
These are the grounds to the Injectors, Ignition Coils, and Fuel Pumps. All are Engine devices. Not airframe devices.

Note that the Ground Bundle coming from The LANE B (X2) harness is labeled Regulator "A".
There are No Regulator "B" Ground Bundles.

The Regulator "B" Grounds are only for Airframe devices. The Main Battery and Everything on the control panel not directly related to the engine. Lights, Radios, Etc.
Last Edit: 3 weeks 1 day ago by Bill Hertzel.

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3 weeks 1 day ago #17388 by Bryan Casper
Bryan Casper replied the topic: EMS Ground vs Aircraft Ground after connection of ground bundles
Bill, thank you for kindly answering my question. It is very clear now.

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