Posted by pete 23 on March 20, 2011 at 16:33:56 from (173.87.146.142):
In Reply to: resisters and coils posted by redgems on March 20, 2011 at 14:50:36:
I will just add that IH used to mark their coils as 12 volt or 12 volt R, with the R meaning to be used with a resistor. This confused a lot of people as IH used a lot of R suffix's in their part numbering system so some though it was just part of the number. Of course it is easy to tell with an ohmeter if it is 12 volt or not. Most 6 volts will run about 1.5 ohms on primary and 12 volt will be about double that . I remember when IH switched to using a 6 volt coil on the 450 diesel tractor and no resistor so as to give a hotter spark for starting and as it only ran a short time on gasoline and then was shut off on diesel it was not a problem. However, so many of those manifold switchs failed and were bypassed and then the key had to be shut off, so guess what, lot of coils and points had a short life.
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