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You will need one of these or something similar to measure DC amps with a multimeter
 

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There was no way for me to clamp it around the fuselink so I just took a spare ground wire hooked it up and clamped it around that. Not sure if that will affect accuracy.
Unless it is the main ground wire connected directly to the battery with no other wires connected to the post then you will not be measuring all the current being fed to the electrics.
 

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Taking measurements with a clamp meter around a wiring loom is not accurate either since there may be negative wires running in the loom which will SUBTRACT current from the positive current carrying wires in the same loom.
Since there will be current flowing from the alternator and the battery depending on connections, you need to find a single point of current flow through the fusible link either before or after to best measure what current might be flowing through it.
 
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