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ezCAN Mojave Fuse Settings

Started by key, July 17, 2026, 11:20:10 PM

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key

Hello all. I'm running an ezCAN Mojave as a means to power an auxiliary brake/taillight on a 2025 BMW R12 nineT. Taillight is connected to the ezCAN yellow circuit; all other circuits are unused and have been disabled.

The default fuse setting for the yellow circuit was originally 5A, and at that setting everything worked as expected. There was, and still is, a 1 or 2 second delay between the illumination of the OEM lights and the auxiliary taillight when I power up the bike, but I assume that's normal behavior for the ezCAN. Please advise if not.

Back to the fuse settings: ezCAN's diagnostic function shows that the taillight uses a peak amperage of about 0.5A, so based on that I decided to reduce the default fuse setting from 5A to 4A. After doing so the taillight no longer powers up unless I power-cycle the bike, at which point the tail/brake light works on the second attempt. Seems that powering the bike on/off resets something within the ezCAN which then allows it to function normally. Not sure what that might be other than the fuse protection setting. If I change 4A back to 5A, the problem goes away.

This might be analogous to when I complain to the doctor about how it hurts when I poke myself in the eye and he tells me the cure is to just stop doing that. It's not really a problem to have to use the 5A fuse setting, but why does a low-amperage device like an LED taillight need such a high setting to operate correctly? The taillight wiring harness uses conductors that are as fine as frog hair, so I'd prefer to not set the fuse any higher than necessary. Anybody encountered anything like this before?