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Wiring field

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7suds(at)Chartermi.net
Guest

Posted: Fri Jan 27, 2006 6:01 pm Post subject: Wiring field

All,

I am beginning to tear into the wiring on my 5, I want to get to know it 

since I did not do it. It has a breaker marked "Field" only one wire from 

the breaker (other side of breaker to nothing) to half of the master, other 

side of master has a wire that dead ends in the harness to nothing?? Im 

confused, anyone know what this is for? Is it hooked up right? Where should 

it go?

Lloyd

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ddsyverson(at)comcast.net
Guest

Posted: Fri Jan 27, 2006 7:56 pm Post subject: Wiring field

Lloyd,



You are probably looking at someone's previous custom work where they may have 

used a split alternator switch and only used part of it. Normally these have 

one side to connect the main bus to the battery and the other side to connect 

the field of the alternator to energize it sp it produces current. The 

nomenclature is somewhat of an artifact from the days when we had generators, 

since, on a generator the field is part of the frame (which energizes the 

generator)  and the output current is pulled off the armature .... on an 

alternator - the field ends up being the rotor and the frame coils produce 

the output, but we still call the energizing part of the device the "field" 

even if it is the spinning part. 



It is pretty much impossible to tell you if it is hooked up right or not. What 

is right depends on what kind of a system you have (rotax, auto, or  

lycombing/continental which are pretty much like an auto charging system)   

and if the original builder actually used the switch for that purpose, or if 

they used a salvaged alternator/ bus switch for something else. A guy is 

going to have to trace wires and understand how their system is wired and to 

what, unless the original builder left you some sort of notes.



Good Luck,



Dave

St Paul, MN



do not archive

On Friday 27 January 2006 8:14 pm, Cudnohufsky's wrote:

 	  Quote: 	
		   



 All,

 I am beginning to tear into the wiring on my 5, I want to get to know it

 since I did not do it. It has a breaker marked "Field" only one wire from

 the breaker (other side of breaker to nothing) to half of the master, other

 side of master has a wire that dead ends in the harness to nothing?? Im

 confused, anyone know what this is for? Is it hooked up right? Where should

 it go?

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smokey_bear_40220(at)yaho
Guest

Posted: Fri Jan 27, 2006 9:29 pm Post subject: Wiring field

Hi Lloyd,



I agree with what you have already been told, that

there are several ways to wire the

battery/master/alternator.  You'll need to chase wires

and make your own diagram to really know it as is.



Is your plane operating like this?  I assume you are

talking about a split master switch?  As I understand

it, the field side of your master goes to a CB and

then nowhere?  And the B+  solenoid

(battery/alternator) side of your master has a wire to

nowhere?  Sounds like this switch isn't doing

anything.



One pretty normal setup is with the B+ side of the

master switch wired to ground on one side and the

battery solenoid on the other.  That is for a solenoid

that is "on" when grounded thru the switched pole. 

The 2 other major poles off the solenoid are for the

battery and for the aircraft systems.  Don't reverse

the battery in and out poles.



The field (alternator) side of the master switch might

use B+ power on one side, then thru the switch to a CB

and the alternator field off the other side of the

switch.  This could be wired differently too,

depending on your alternator.



I think you need to first find out how your alternator

and master solenoid work before you can determine if

they are wired properly.  Even when your head is well

wired for electrical systems, this is going to take

some grunt work.



Kurt S.



--- Cudnohufsky's <7suds(at)Chartermi.net> wrote:



 	  Quote: 	
		   All,

 I am beginning to tear into the wiring on my 5, I

 want to get to know it 

 since I did not do it. It has a breaker marked

 "Field" only one wire from 

 the breaker (other side of breaker to nothing) to

 half of the master, other 

 side of master has a wire that dead ends in the

 harness to nothing?? Im 

 confused, anyone know what this is for? Is it hooked

 up right? Where should it go?


	


 	  Quote: 	
		   Lloyd

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AMuller589(at)aol.com
Guest

Posted: Fri Jan 27, 2006 10:17 pm Post subject: Wiring field

Does yours have the Engine Instrumentation System or the EXP  2 bus 

installed? If so I have develop simplified circuits of these  components and unified 

them into one simple diagram for trouble shooting by the  pilot.

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7suds(at)Chartermi.net
Guest

Posted: Wed Feb 01, 2006 7:04 pm Post subject: Wiring field

All,

Thanks to everyone who offered info, Dave, I think you are correct about the 

wiring being for the field of an alternator, and yes it is through a split 

master and the other side is wired across the master terminals of a Kuzelman 

Hot Box.. I have been opening all harnesses and tracing wires. The system is 

using a Kuzelman Hot Box and it looks like it may have been added at a later 

date since the  Ducatti Rectifier / regulator is wired according to the 

Kitfox manual and not wired into the Hot Box as the Hot Box is designed to 

have it wired. Questions, does anyone have any experience with the Kuzelman 

Hot Box? Anyone running one? Also, after the hot box on the hot side of the 

master switch circuit there is what I call a fusible link block, has 2 

terminal connections on each side of a brass bar link, block seems to be 

made of maybe Bakelite and was mounted to the firewall, has a rating of 30 

amps and it looks like the person who wired this is using that cluster to 

feed the circuit breakers, Something seems wrong with that to me since it is 

pulling from the hot side of the master circuit which has an internal 

thermal couple, and from my understanding is designed to energize the 12 

volt fused terminal strips above it and have the power pulled from there, 

any comments welcome.

Thanks,

Lloyd

---

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