Fuse for the wire size; smoke escaping from the wire is a fire hazard.
If the motor stall current is consistent at 12A, I'd go with 15A fuses -
enough to cover the motor loads but only just enough. (A 15A automotive
fuse will carry 15A forever (c.f.
https://www.littelfuse.com/~/media/automotive/datasheets/fuses/passenger-car-and-commercial-vehicle/blade-fuses/littelfuse_mini_datasheet.pdf
and
http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/product-datasheets-b/bus-ele-ds-2009-atc.pdf)
but will fuse in 750ms at 20A
HTH,
Donald.
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On 2019-11-05 5:44 p.m., john niolon via Shop-talk wrote:
> Iâ??m wiring for my power seats in my truck project. My wiring harness
> didn't include this circuit so I'm coming off a battery termination
> point. Thinking about fusing each seat. The internal wiring is 14 ga and
> doing a amp check I read from 3-6 amps with any of the 3 motors
> (tilt/raise/for-back) running and around 12 amps when you hit the stops
> and the motor stalls. I know 14 ga is good for 18-20 amps but I'm trying
> to decide how much to fuse it.. I wanna keep the smoke inside but don't
> want to fuse too high.... would you consider a percentage over stall amp
> draw or running amp draw..... and what safety factor ?? I should
> already know this at my age...
>
>
> john
>
> https://jniolon.classicpickup.com/
>
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