You would need to know the weakest point in the power distribution and you'd need to know the peak and nominal current draw in Amperes. If it's a device that uses a surge of current at startup but only a fraction of that during normal operation, you would need a "slow-blow" fuse. If the current draw is consistent you would need a conventional fuse. Still have no idea what the "head unit" is that you're trying to fuse.
watts Divided by Volts = amps
The relay just plugs into the fuse/relay box, installing it means reading the owners manual to determine the correct location and plugging it in.
Open fuse box, locate correct fuse using the fuse diagram, and replace the blown fuse. www.nationalautoinc.com
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Continuity setting.
Replace a blown fuse with the correct fuse that it calls for. There is a reason the manufacturer put it in there.
The fuse will blow as soon as you turn it on. Use the correct fuse and nothing else.
Use the correct fuse and nothing else.
Normally it's located under the hood in the fuse box next to the battery. Under the cover should tell you which fuse is the correct one.
NO! Using a larger amp fuse defeats the purpose of the fuse to protect the wiring in the circuit. This can cause a fire. Always use the correct amp fuse for that circuit.
NO! Using a larger amp fuse defeats the purpose of the fuse to protect the wiring in the circuit. This can cause a fire. Always use the correct amp fuse for that circuit.