starting problems on 1991 Mazda MPV

starter will not disengage when starting.
or when shut off, starter keeps running untill battery goes dead. why?????

Asked by for the 1991 Mazda MPV
You either have a short in the wiring, bad ignition switch or a bad starter. If you pull the wire off the starter (the one from the ignition switch) and it continues to run, the starter is bad.
1 more answer
replace it it is shot