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In Reply to: Update: Re: JD 160 blowing fuses posted by JT on Thursday, July 17, 2003:
Don't know if this will help at all or not. The current LT160 uses a Kholer CV-460 engine. According to the service manual for this engine:
http://www.kohlerengines.com/pdf/tp_2339_d.pdf
the red wire (B+ 12vdc) comes off the "Spark Advance Module" (which also has a brown wire = coil input, yellow wire = semiconductor switch & a green or black wire = ground). Diagram is page 8.6.
If this is the assumption, and the fuse is connected in-line with the red wire to the SAM, something in the spark advance module or the ignition module is shorted. That would also account for the engine failing to start.
There is another diagram on page 8.14 that shows a red wire coming off the +terminal of the selenoid, running to a ammeter (possible the back of your "black box", to a in-line fuse & to the (B) terminal of the ignition switch.