1989 mercury tracer/mazda 323

[harpdog]

this merc is a mazda 323 with a merc name.
not sure the engine size but mayb 2.0.
dash lite "check" with pic of an engine shows. the 80amp fuse keeps blowing which is under the hood on a fuse box that has 2/30a,2/60a, and 1 80a fuse on it. Once the fuse is replace, the engine starts and runs for 5 mins or so then the fuse goes again and it won't start.
I cannot seem to find where this fuse set goes or why it blows.
any help would be greatfully recieved and thank u in advance