Replaced 4 starters in a year on 1994 mazda b-3000

I have Replaced 4 starters in a year on 1994 Mazda B-3000 and its going on another! Is there a recall for a faulty part or is there maybe a power surge (too many amps) going through it and burning it up? I am stumped and tired of changing starters! Another thought, could the bendix be sticking and turning with the flywheel while driving, causing it to burn up?

You should be able to verify that the starter relay is releasing by putting a voltmeter between the starter and ground. It should read voltage for the short time the ignition switch is engaged, then it should fall back to zero. If it doesn't, replace the relay.

If you live in a cold climate, lower viscosity oil will put more of a load on the starter. If that's it, you should hear the engine struggle to start. Anything that increases the load on the engine when it's cold will pull more amperage through the starter.

If you have bought all of the starters at the same place, try a different place next time. They may have bought a boatload of starters, all with the same flaw.

There is a design flaw in the truck where the starter is situated directly under the oil filter. If not installed properly or during a hasty oil change the oil filter can drip oil onto the power leads for the starter. Over time the oil will work it's way between the power contacts and then attract dust and road grime. The result is a poor electrical connection and the starter will click but nothing more. Disconnect the battery, clean the area around the oil filter and starter with a rag, disconnect the power supply at the starter and clean the contacts, reconnect and try to start it. Works for me two to three times per year. Hope this helps.