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David321

507 posts

Ultimate Geek
+1 received by user: 105


#306571 4-Aug-2023 12:13
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Hi all,


 


I have just ordered a 70mai m300 dash cam off aliexpress, I also selected the option to have the hardwire kit included. 


I am looking to buy those car fuse adapters so I can wire the kit directly into the fuse box, for those of you who do not know what they are they are a bit of wire with a car fuse plug at one end that has a slot for two fuses on the back of it, the idea is you remove a car fuse, plug this wire in, then put the car fuse in this adapter and then whatever size/amp fuse you want for what you intend to power into the other slot.


I am curious though, what size fuse should I use, I can not seem to find the answer anywhere, as pictured th hardwire kit does not seem to have a fuse in it, just a black box where I assume the voltage conversion happens.




 


 


 


 


 





_David_

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RunningMan
9186 posts

Uber Geek
+1 received by user: 4840


  #3111833 4-Aug-2023 16:52
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There's 2 seperate discussions going on here - fuse size, and fuse current rating.

 

1) Fuse size - OP has to determine this by checking the car
2) Fuse current rating - 2 parts to this

 

a) Original circuit needs to be protected by the same rating fuse.
b) New circuit needs a fuse of suitable rating for the new cable run to the camera.

 

The fuse's primary role is to protect the wiring loom from an overload or short circuit condition and would be related to the cross sectional area of the conductor - the thicker the cable, the higher the fuse rating. It's OK to go lower for fuse rating as long as it's not so low you get nusiance blowing. As a starting point, 10 amp fuse for 1mm^2 cable is a good starting point.


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