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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