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WC ingition resister

A

Anonymous-0

Well-known Member
Hi all, what are you guys using for the coil resister from 12 v - 6 volt . I burned a set of points in no time just idling , replaced them and she fired right up. I blamed the voltage being too high ?
 
Most of the time I use a Dodge 2 wire resister on my 12 volt conversions. If you want to be able ti hide it easy on the switch box use a O'Reilly's auto parts ballast resister VR-1 cost around $7 or so but can be mounted in a hole in the box and that works well as a heat sink to help keep it cooler
 
I buy them from NAPA or Tractor Supply or Rural King etc. A typical ballast resistor ohms range for many old 12 volt tractors using 6 volt coils might be in the range of 1.25 to 2 ohms.

Indeed if the resistance is too low and youre switching too much current in the points (4 to 5 amps is max on many points equipped tractors) they will burn up prematurely and the coil can run a bit warm.

If you wanted a 50 50 voltage divider where you drop 6 volts across the ballast and leave 6 for a 6 volt coil, their resistance would be the same as the coil. Many typical (not all) old tractor 6 volt coils are in the 1.25 to under 2 ohms primary LV range as likewise, many ignition ballast resistors.

With Ign ON and points closed put a meter on the coils input (looking for 6 to 7 volts, if too high, points will burn up quicker and coil get hot) and you will see how may volts the ballast dropped. Or you could just measure the voltage drop across the ballast itself.

That help??????????

John T
 
Forget the resister. Just use a genuine 12 volt coil, marked "no resister required". NAPA part number IC14SB or equivilent, costs 15 -20 bucks.
If you get one marked "use with external resister" it is a 6 volt coil, not what you want.
Willie
 
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