Typically they have a 15A and sometimes a 20A fuse, however it's really
dependent upon how you wired it.  Assuming you used a sufficiently heavy
gauge of wire you should be fine at 15 or 20. I know there was a post a
long time ago talking about what gauge wire could accept what amount of
current, I'm sure an archive search or a google could find it.

Jeffrey Tschumperlin wrote:
> What inline fuse size should I use for this?   Sure there is a way to
> determine what amp fuse protection you need depending on the device
> (draw)
> but I'll be darned if I know it.
>
> Thanks,
> Jeff Tschumperlin
> Bert - 87 Westy Syncro
>