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12 volt conversion on a 9n

S

SDE

Well-known Member
3# wire alternator. Where should I locate the 12 to 6 volt resistor? In front of the original resistor that is mounted on the dash or after it?
TY
SDE
 
(quoted from post at 10:12:49 09/24/22) 3# wire alternator. Where should I locate the 12 to 6 volt resistor? In front of the original resistor that is mounted on the dash or after it?
TY
SDE
Click to expand...
oes not matter
 
If you can find a place that will work as a heat sink that is good so it dissipates the heat the resister tend to have
 
JMOR, I am not a Ford guy so maybe I should stay out
of this. I am just surprised that you can answer that it
does not matter. Usually a resistor will have a different
voltage on each end. What does that stock resistor do
or feed?
 
What resistor are you talking about?
If it's a ballast resistor for the coil, yes it matters?
Are replacing the coil, then it matters.
I need more information. A picture is helpful.
 
The resistors are in the circuit to reduce coil current. As a result, the coils will be at a lower voltage than w/o resistors. It is a series circuit, so, battery, resistors, coil or resistors, coil, battery, or coil, battery, resistors.....all the same.
 
I never worked on a 6v tractor?
Did 6v tractors use a ballast resistor?
If so what voltage showed up on the coil, what voltage across
the Ballast and what current does the coil need?

Someone converted my Jubilee before I bought it.
The ballast uses 6v, coil 6v and 4 amps current in the coil.
That works and doesn't burn the points..
 
Mine is after the OEM resister on the dash. I made a bracket and mounted it above the starter switch where the 6 volt cut out was located. The wire goes from the dash resister down to the resister I added and then goes through the spark plug wire tube to the coil.
 
Only 6 volt tractor I know of that had a ballast resister was the 9N/2N and early 8N with the front mount coil. Volts at the coil on them was around 3 volts
 
(quoted from post at 14:47:08 09/24/22) I never worked on a 6v tractor?
Did 6v tractors use a ballast resistor?
If so what voltage showed up on the coil, what voltage across
the Ballast and what current does the coil need?

Someone converted my Jubilee before I bought it.
The ballast uses 6v, coil 6v and 4 amps current in the coil.
That works and doesn't burn the points..
Click to expand...
ot all the same. Ford with front mount coil uses ballast resistor and 6v battery voltage. Such coil has very low resistance of around 0.5 to maybe 1.5 Ohms(as aftermarket coils entered picture) and the 6v divides about 50/50 between the coil & resistor. Many others have a coil with about 1.2 to 1.3 Ohms use no ballast resistor, such as 8N side mount distributor, Farmall SMTA, NAA, etc.
 
Okay thanks JMOR! I partly misinterpreted what the OP
said in addition I did not know that there were 6 volt
systems that reduced coil current by using a resistor.
To the original poster hopefully you know that your ..12
to 6 volt resistor.. has nothing to do with the alternator
wiring. Resistors can be used in place of the diode
shown in the attached diagram At the moment I cannot
give you a certain value for a resistor that would work, I
believe a 10 ohm would do it. Maybe someone
else can chime in to agree or give the correct value. A resistor commonly used to
reduce coil current will not work properly when placed
in the excite circuit to spade terminal 1, the engine will
continue to run when the switch is turned off.
Delco 10si wiring diagram
 
(quoted from post at 17:02:46 09/24/22) Okay thanks JMOR! I partly misinterpreted what the OP
said in addition I did not know that there were 6 volt
systems that reduced coil current by using a resistor.
To the original poster hopefully you know that your ..12
to 6 volt resistor.. has nothing to do with the alternator
wiring. Resistors can be used in place of the diode
shown in the attached diagram At the moment I cannot
give you a certain value for a resistor that would work, I
believe a 10 ohm would do it. Maybe someone
else can chime in to agree or give the correct value. A resistor commonly used to
reduce coil current will not work properly when placed
in the excite circuit to spade terminal 1, the engine will
continue to run when the switch is turned off.
Delco 10si wiring diagram
Click to expand...
0 Ohms in alt excite circuit is the value GM used. It was in parallel with the charge indicator lamp. Whereas a ballast resistor is typically closer to 1 Ohm & as you say is not suitable for the alt excite circuit.
 
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