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Old 05-05-09, 22:14
Jordan Baker's Avatar
Jordan Baker Jordan Baker is offline
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Default Coils and resistors

Hi everyone.

I just picked up a coil for my UC today and it says it doesn't require any external resistors. My wiring on the UC is back to factory specs with a resistor. Should I bypass the resistor or can I still use it. Would it affect the coil at all being "doubled" resistored. And if it makes a difference its a 6 volt positive ground system.

Thanks
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Willys MB, 1942
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Old 06-05-09, 02:41
Bob Carriere Bob Carriere is offline
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Default Where oh where....

Hi Jordan

Where did you get that coil...... last I found from the tractor dealer an TSC were clearly stamped that they must be used with a resistor...???

would make life much easier.....

Thanks

Bob
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  #3  
Old 06-05-09, 09:00
Lynn Eades Lynn Eades is offline
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Default Jordan

If its a six volt coil, and your running six volts, and it says no resistor required, then dont use one.
The original Ford coil is designed to run on 4.5 volts, and it gets this 4.5 volts, by applying 6 volts to a resistor,(in the instrument panel) out of which is delivered 4.5 volts, to the coil.
If you try to run your 6 volt coil on 4.5 volts, your high tension voltage will suffer dramatically, and it more than likely wont even fire.
Later vehicles with resistors usually worked something like this:
With a 12 volt system they would use a 12/9 volt ballast coil.
When the engine is running the coil gets a reduced voltage (9 volts) through a resistor. When the key is switched to the "start" position, the resistor is bypassed applying the full 12 volts to the coil. This effectively increases the spark at a time when it would otherwise be weakened by the load of the starter motor under cranking.
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Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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Old 06-05-09, 09:19
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Jordan Baker Jordan Baker is offline
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Default

Coil came from Napa. Part # IC7 The cat. listed a bunch with no info as to what needed a resistor or not. I guess I will have to figure out how to bypass the resistor then.

Just to make sure. Is is the part with the porcaline or the fiber piece with wire wrapped around it.

As you can tell, electrics aren't my strong point.
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C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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Old 06-05-09, 11:10
Lynn Eades Lynn Eades is offline
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Default Jordan

This is your isnt it? The white bit with the fine wire wound around it.
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Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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  #6  
Old 06-05-09, 11:28
Lynn Eades Lynn Eades is offline
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Default Jordan

If you put your volt meter onto the top nut (the one with the wire on it)(from the nut to earth) youll get your 6 volts.
From the other nut to earth youll get 4.5 volts.
Just hook your coil feed wire to the same nut that the wire is already connected to.
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Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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  #7  
Old 06-05-09, 14:06
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Thanks and just to confirm its the nut with the red arrow?
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RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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  #8  
Old 07-05-09, 02:39
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Jordan Baker Jordan Baker is offline
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Default

Thanks for the help. Im happy to report that I did as instructed and my Carrier fired right up. And does it ever sound "sweet" with the NOS mufflers installed.

Now I just need to sort out the wiring for the generator and I am good to go.
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RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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  #9  
Old 07-05-09, 11:16
Lynn Eades Lynn Eades is offline
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Default Jordan

thats the right nut. Now what are the generator problems?
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Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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