Not Getting 12 Volts at Coil

While we are at it tracing wires, let's look at the starter relay:

A = 10ga red from +battery
B = 10ga red to fusible link at bulkhead connector
C = 12ga brown to starter
D = 18ga brown to EGR timer
E = 18ga yellow to starter interlock switch
F = 20ga brown w/ yellow tracer to neutral safety switch at transmission