I have an old 3610 ditchwitch trencher i recently purchased, but Haven’t started it in a couple months. Today, i turn key, 2 of the 3 interlock lights turn on green, but bottom one not lit, no crank, no solenoid click. In neutral, chain not engaged. Battery solid 12v. Tried cleaning terminals, boosting battery. Really need a wiring diagram to troubleshoot. Fuses are good. Appreciate any help
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