I have a vehicle battery maintainer (20A) that was overloaded and stopped working. On inspection I found a group of traces blown, however all the traces are connected at both ends. It looks like a plane that was divided into 4 traces with the coating removed and solder spread across the traces. There are other traces like these in the surrounding area.
I could easily bridge these point with wires, but my Question is why would they design the board like this? Is it done for RF cancelling or as a safety precaution in case of overload (such as what happened)?
EDIT: It looks like the traces are from the transformer to a diode bridge and a coil.