The simplicity broardmoor series tractors were made for many yrs & the actual wiring on tractor probably changed also over the yrs,I looked at one wiring diagram for a broadmoore online & the neg voltage to sol coil was provided by transmission safety/netural sw,the +12v to sol from ign sw(S)ran thru the pto safety sw,thru an inline diode and then to other side of sol coil,this might explain the dim light when checking depending where you're checking to as a reference,without a simplicity mod# the diagram I looked at may/may not match your tractor.
The best thing you can do to help yourself is click on link below & see if you can cross ref allis mod# to EXACT simplicity mod#,after that take mod# to a simplicity dealer & see if he can provide you with a wiring diagram OR do a google search for simplicity+mod#+wiring diagram,you might get lucky & find diagram online
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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