BFL13 wrote:
I feel that my world has turned upside down!
The fuse that "protects the positive wire" (from "becoming the fuse") between the battery and the converter, which fuse is to be mounted near the battery post, is "after" the battery, not before it. The threat being the battery shorting, not the converter shorting.
The short wire between the battery and that fuse is not "protected" but the long length "after" that going to the converter is protected.
All that indicated to me up till now, that the fuse came "after" the short so it would blow and protect whatever came next "after" the fuse.
Fuses protect from over current in a complete circuit no matter where they are located. With a power source supplying a wire, typically the fuse is placed nearest the positive to protect the maximum amount of wiring. This makes sense only because the chassis is grounded and a short circuit can therefore only occur on the positive wire.
In the case of shorted battery connected to a converter, a fuse anywhere along the positive wire will suffice, however a fuse located near the battery will not protect the converter from a short between the positive wire and the chassis.
The OP’s fuse blowing on the circuit board means there is a short in one of the components on the board.
