My father in law has connected his Honda Accord battery to the wrong terminals.

There is a fuse blown, i can't tell you where it is but i know a Tech. here that can, wait awhile for your answer. May check owners manual.

It will be a LARGE 80 or 100 amp main fuse in the underhood fuse/relay box , held in by screwas connected to where the battery cable comes into the fusebox. easiest place to get the fuse would be at the dealership.Be prepared , they may have to special order it.

ck under hood fuse box there may be a large fuse blown. somewhere between 40 and 100 amp fuse