Josh in Pa
Member
When converting a tractor to 12 volts, do I need to add a resistor before the points? I've been told 12 volts will cause points to burn up faster.
Josh
Josh
- Thread starter Josh in Pa
- Start date
You could change the coil to a 12V as well then the resistor is not necessary. A coil with appx 3 ohms of primary resistance will not burn points. Typically a 6 V coil will ohm out at about 1.5 ohms, not enough to keep the points from burning without help. mEl
YES 12 volts on a 6 volt coil sure will cause the points to burn up very fast PLUS the coil will overheat badly and get fried.......
When you convert from 6 to 12 volts and wish to still use the old 6 volt coil YOU HAVE TO ADD AN EXTERNAL SERIES VOLTAGE DROPPING (12 to 6) BALLAST RESISTOR BEFORE THE COIL, I.E. BETWEEN THE IGNITION SWITCH (its IGN output) AND COIL INPUT (thats NOT the output side that wires to distributor).
That way a 6 volt coil sees only 6 volts as designed for since 6 volts is dropped across the ballast resistor. 6 across ballast, 6 across 6 volt coil = 12 volts.
If you do not add the ballast and apply 12 volts to a 6 volt coil, THE COIL WILL OVERHEAT PLUS THE POINTS BURN UP QUICK since the current is doubled whats its supposed to be...
The OTHER OPTION if you dont want a ballast is to use a 12 volt coil no ballast then required.
Get it???????????
John T
When you convert from 6 to 12 volts and wish to still use the old 6 volt coil YOU HAVE TO ADD AN EXTERNAL SERIES VOLTAGE DROPPING (12 to 6) BALLAST RESISTOR BEFORE THE COIL, I.E. BETWEEN THE IGNITION SWITCH (its IGN output) AND COIL INPUT (thats NOT the output side that wires to distributor).
That way a 6 volt coil sees only 6 volts as designed for since 6 volts is dropped across the ballast resistor. 6 across ballast, 6 across 6 volt coil = 12 volts.
If you do not add the ballast and apply 12 volts to a 6 volt coil, THE COIL WILL OVERHEAT PLUS THE POINTS BURN UP QUICK since the current is doubled whats its supposed to be...
The OTHER OPTION if you dont want a ballast is to use a 12 volt coil no ballast then required.
Get it???????????
John T
old
Well-known Member
- Location
- Camdenton Missouri
Simple answer is yes or replace the coil with a true 12 volt coil. I my self use O'Reilly's part #VR-! for the ballast resister. It is easy to hide and can be mounted like you would a switch
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