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Thread: 915iS Wiring Questions

  1. #1

    Join Date
    Dec 2019
    Location
    Idaho
    Posts
    34

    Default 915iS Wiring Questions

    I'm in the process of designing the electrical system for my SS7 which will have a 915iS and VP-X. I'm hoping that someone that
    has installed a 915 can answer some questions. I believe that the 915iS is configured the same as the 912iS and has the
    same basic components so someone with a 912iS might also be able to help.

    1) The installation manual for the 915iS leaves a lot to be desired On page 52 there is a diagram of the overall wiring but the
    quality is so crappy it's almost impossible to read. Is there a better version of this diagram somewhere? The equivalent diagram in
    the 912iS manual is much higher quality. Can I just use that?

    2) The 915iS has a "fusebox" which has the 2 voltage regulators attached to it and some magical circuitry I assume. Typically one would
    manually wire a voltage regulator by providing a field power and field sense wire. I don't see this anywhere in the installation manual.
    Are those functions built into the 915iS controller already so I don't need to provide them from an external source?

    3) Does the 915iS voltage controller have built-in Over-Voltage protection which will disable the generator if necessary?

    4) I was planning to install the typical engine sensors which are then connected to the Garmin GEA-24 Engine Information System which sends
    that data to the G3X. I see a mention, though, that the 915iS ECU can connect to the CAN bus and provide sensor
    info directly to an EFIS. How do I determine which info is already provided by the 915iS ECU to the G3X so that I don't duplicate functionality?

    5) I don't see the starter relay mentioned anywhere. Is that already built into the control electronics and all you need to do is provide
    a switch that enables it?

    Any help would be greatly appreciated!

    Victor
    Building SS7
    915iS
    Garmin G3x

  2. #2
    Senior Member
    Join Date
    Dec 2017
    Location
    Mapleton,UT
    Posts
    931

    Default Re: 915iS Wiring Questions

    Check out PPS from vertical power. I would of incorporated it into my build if it was out when I built. Sorry canít answer most of your questions, but a few just went down the road your starting and they can chime in. I do know that you can connect the canbus to the 915 ecu, just not sure what sensors you can see as I am also interested. Someone should post a screen shot of what they are getting? Can you see intake temps(manifold temp) EGTs, chtís?
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF......FLYING!
    N53TF......FLYING!

  3. #3

    Join Date
    Dec 2019
    Location
    Idaho
    Posts
    34

    Default Re: 915iS Wiring Questions

    Quote Originally Posted by Shadowrider View Post
    Check out PPS from vertical power. I would of incorporated it into my build if it was out when I built. Sorry canít answer most of your questions, but a few just went down the road your starting and they can chime in. I do know that you can connect the canbus to the 915 ecu, just not sure what sensors you can see as I am also interested. Someone should post a screen shot of what they are getting? Can you see intake temps(manifold temp) EGTs, chtís?
    I actually had the PPS in my design but removed it. The PPS replaces the high-current relays like the starter and mains and simplifies
    alternator wiring but I think that most of that is already provided by the 915iS electronics. The only thing the PPS offered that
    was left were shunts and those are cheap to buy. The PPS costs $1700 and since my budget is somewhat blown by deciding on
    the 915iS it did not make sense to include it anymore. Since I live close to KF I should probably pay a visit and see how they wire
    up the 915iS.

    Considering the cost it would be nice if the installation document was more clear.

    Victor
    Building SS7
    915iS
    Garmin G3x

  4. #4
    Senior Member
    Join Date
    Dec 2017
    Location
    Mapleton,UT
    Posts
    931

    Default Re: 915iS Wiring Questions

    I hear you. Wish kitfox would update instructions and make a few videos for clarification. FYI you donít need a shunt with the VPX. It knows amp draw of everything going out and totals them to give you total amp draw.
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF......FLYING!
    N53TF......FLYING!

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