Can you get to the starter/solenoid with your meter?
If so, check the voltage at the spade terminal with the wire connected while holding the start switch on.
If the reading is low, below 9VDC, there is too much voltage drop. Could be a failing neutral switch, a weak starter switch, a loose, bad corroded connection somewhere between the battery (the fuse you just replaced) and the solenoid.
Keep checking, working back from the solenoid until you find the drop. It must be tested under load, holding the switch to start.
If you have good voltage at the spade terminal, check the voltage at the stud going into the starter itself, after the solenoid. If there is voltage there while holding the start switch, the starter is bad. Probably bad brushes.
If good voltage at the spade and no or very low voltage at the starter stud, the solenoid is bad or may just need to be cleaned inside. Sometimes dirt and oil collect inside the solenoid and starter and gum up the works.
Since this started when you replaced the fuse, there may be voltage drop at the new fuse holder. Might consider replacing the fuse with a fuse link. A fuse link is a sacrificial link of wire designed to burn out if there is an overload. It will give better connection, less resistance than a fuse holder especially if it is exposed to weather and vibration. Size the fuse link to approximately the output of the alternator if the alternator charges through the link. If not, then about a 40 amp will be sufficient.
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