MTFCA Forum

Having never had, or used a master vibrator COIL on a Model T, but having owned five T's from 1913 to 1927, I am curious to how they replaced a Model T's original four coils and how they were wired into a T's ignition. Just curious.

I'm not sure if this gives all the explanation needed but does show much about them.
http://www.mtfca.com/discus/messages/331880/348361.html
And
John F. Regan on Monday, February 08, 2010 - 12:33 am:
"Just to add to Ron's notes. Notice that when using a master vibrator, the act of shorting the points across on each coil then also shorts across the internal capacitor in that coil. If you plan on using a master vibrator with a set of coils, you need not remove a defective internal capacitor that might be found inside one of the individual coils since it will be shorted out when the coil is used with a master vibrator. The master vibrator has the capacitor inside it and that one capacitor is used in turn by each coil as it is fired. The use of a common set of points and a common capacitor results in a much better balance of the ignition firing but of course the master vibrator points will need to be replaced 4 times as often compared to coil points. The later KW master vibrator with the later points is a much better design than the other types."

Various of the early versions of coils didn’t have the “rebound spring” on the points (Heinz as a example). The behavior of each individual coil had a lot of variation. As stated above, the master vibrator solved some of the issues.

here is another thread about the master coils.
http://www.mtfca.com/discus/messages/41 ... 1409382732

Andre
Belgium