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Farmall Electrical: SH, 300, 400

M

Matt Weltz

Member
Ok guys I think I am starting to confuse myself so am asking for some help. I have the following scenarios:

SH with 12V battery, Alternator, 12V igniton coil and ceramic resistor, 12V lights.

300 with 12V batter, 6V Generator, 6V ignition coil and ceramic resistor, 12V lights.

400 with 12V battery and nothing else hooked up.

I just bought the 400 and none of the electrical is hooked up. Assumed to be all original components and generator is shot. Looks like an alternator and 12V ignition coil will be cheaper than a rebuilt generator. My question is: why does the SH have a ceramic resistor??? Does it really need it having a 12V ignition coil? Thank you!!
 
HI i rewired my 400 to 12 volt and used the 6 volt coil. It depends if you put the resistor before or after the coil. There are diagrams for the conversion on here do a search. I put the resistor before the coil and did not have to change the coil to 12 volt.
 

Matt,

There are two types of "12V" ignition coils.

One requires the external resistor, and will say "Use with external resistor." The other has an internal resistor, and will say "With internal resistor." At least, they should on the package.

The 12V coil that requires an external resistor is exactly the same as a 6V coil.

Why do they call the coil 12V if it requires an extra resistor? Probably to simplify things for less mechanical folks with early 12V vehicles. It doesn't make sense to some people to buy a 6V coil for a 12V vehicle.

If your H runs fine, leave the resistor. The coil will burn up if it's the type that requires an external resistor, and you remove the resistor.
 
That makes since. The resistor is beofre the coil. It is a newer coil so I will look and see what is says. There is no voltage regulator on the tractor anymore does that mean it has an internally regulated alternator? Thank you!
 
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