1992 Mazda Navajo

Engine Mechanical problem
1992 Mazda Navajo 6 cyl Four Wheel Drive Manual 260000 miles

Every time I first start the truck in the morning, but sometimes other times as well, the starter keeps running. I can turn off the key and remove it, and it keeps running. I have pulled off the signal lead to the selenoid, and it keeps running. I have replaced the selenoid two times and it still is happening. The second selenoid id a heavy duty " gold" selenoid. What else could be the problem. The starter stops cranking after about one minute. Is there any way to put a kill switch in line to interrupt the flow of juice to the starter?
April 10, 2009.

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