Near Intersection of I-35 & I-90 Southern Mn. | Seems like a mystery. I agree that the CAN bus must have been getting power two ways at times.
I have no experience with a CAN booster but I assume it would be a device that takes in the CAN signals on the green and yellows wires, give them a boost and then sends them out the other end. This device would need a 12V power and ground source of its own to provide the boost. Possibly the booster was not really needed and the CAN signals passed through without the added boost.
This is somewhat similar to a project I viewed online where a string of LED lights was being demonstrated. They could flash, show different colors and go on/off in patterns.
Much like a CAN system Power, Ground and signals were sent along the string from the starting end to the other. If the string was short, it worked fine. If the string was long then the total power needed was more and it dropped off with distance. This meant that the LEDs further away might not work properly.
The trick was to splice on wire to the 12V and Ground wire every 10 feet or so to provide extra adequate power for the LEDs further down the line. The signal lines were fine since they didn't really do any of the "work" of lighting the LEDs.
If the booster wire got cut toward the far end, those LEDs in that area might not work reliably at times since they might be short on power.
Your blown fuses might be like the cut booster wire above. Sort of works without but works better with them in.
This may relate back to the binary idea that so much relies on today. A signal wire needs to be solidly HIGH or solidly LOW. If the signal is somewhere in the middle, the area is in never never land and the system might misinterpret it as being LOW when it is really intended to be High.
I'd check around to try to determine why the fuses were blown.
Edited by tedbear 3/11/2026 16:17
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Agleader Sure Drive-how did it work with blown fuse?
