If you don't have the OM or FSM, there is a link in my sig.
Visually checking fuses is pretty iffy. Get a VOM (AKA multimeter) - you're just checking continuity, so the cheapest one you can find should be up to the task. If power is off, use the ohms setting; if fuse is good, will read very close to zero across fuse. If power is on, use the volts set to the first choice greater than or equal to 15 DC (not AC) volts; if fuse is good, will read close to zero.
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