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What Fuse do you need?
A simple but effective way to work out what size fuse to use when there are so many different motor, PSU and control board combinations...grab a bunch of different size fuses, started with the larger one and decrease the fuse size until you find the point at which a fuse blows. The one used previous to that is what you should be running.
Credit goes to @Pit and @RacingMat: http://www.xsimulator.net/community...-meter-to-test-current-loads-no-problem.6064/
Or for more precision you can actually measure the current load as @Martin van Hagen suggests with a shunt: http://www.xsimulator.net/community...est-current-loads-no-problem.6064/#post-80950