Quick and dirty comp test is if it will blow your finger off the holes and you have good equal pulses it should be good enough to start.
If it isn't cranking fast enough and you have under 10v whilst cranking then you will have starting problems. Under 10v can cause ignition issues. At 9.5V or less you probably will not have any spark to speak of.
Fresh battery, good terminal connections, good grounds, Low starter draw. What I have found with the FC if any of these are marginal or not 100% there will usually be starting issues.
One of the reasons I prefer mazda starters, have seen too many rebuilts that were causing starting problems. Of the hundreds of starters or alternators I have replaced I have only had 2 Mazda's go bad (1 alt 1 starter) and they failed in the first week. Most aftermarket rebuilds have great warranties but I don't warranty my labor for something that I have to replace once a year. Yes Mazda cost more but you will never have to worry about it again. If I replace something I don't want to see the vehicle again for that issue. One of those pay me once now or pay me a bunch of times later. Which always ends up costing more because it ends up with the mazda part.
Mazda says that they are reconditioned. I have taken them apart and darned if I could find anything used. All of the internals were new. Mitsubishi Electronics supplies the new and reconditioned.
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