REFLECTOR: Using the starter supply(+) wire as a charge wire
David Scharfenberg
dave at winco.net
Thu Jan 25 22:17:19 CST 2007
That's how I wired my starter. I did put an ammeter shunt between the
alternator and the starter lug that terminates the #2 cable. The
ammeter functions as a load meter for the alternator rather than a
battery ammeter.
Dave Scharfenberg
On Jan 25, 2007, at 8:02 PM, Terry Miles wrote:
> Hi all,
>
> I thought the sanding would never end, now I can’t seem to get out of
> the electrical design stage and actually start wiring this thing.
> Here is a topic I want to run by the group to see if anyone has any
> experience with this.
>
> I have a Grand Rapids EFIS and engine monitor system. The EFIS gives
> digital voltage readout of the V that it is sensing in its own input
> power line. Additionally there are 3 available power inputs so I will
> have a 2nd and even a 3rd Voltage taps elsewhere (like a hot batt bus)
> if I want it at the expense of using up my user defined auxiliary
> inputs. I mention this because if I go this route, I will not
> install an ammeter. I can’t easily wire in an ammeter now if I have
> my #2 starter supply wire as a charging wire too.
>
> I talked w/ Skytec starters today. On their web site they talk about
> an alternative wiring scheme that eliminates the normal firewall
> starter contactor which is required on certified span cans. I can
> wire my starter button directly to the coil/contactor that is bolted
> to the Skytec starter instead doing the conventional route of
> contactor in the nose that then ports juice to the Skytec contactor
> and its starter motor.
>
> Other facts: The control to alternator output is a manual on/off
> switch on the overhead. I will wire in a 60a current limiter between
> the B-lead and the starter lug as described below.
>
> I will wire the B lead of the alternator over to the now dead Skytec
> input lug and use it like a terminal to the #2 starter (+) wire in the
> utility duct and will now carry juice back to master relay and from
> there to normal bus distribution. .
>
> This is not a new idea. Nuckols mentions it in chapter 7 is his book
> on how to home builts. The Skytec tech support guy saw nothing wrong
> with it, as long as I made sure to cut the jumper wire that now exists
> between that input lug and a (+) jumper to their contactor coil.
>
> Am I missing anything? Is anybody running this way?
>
> Thanks,
> Terry
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