My starter in my pajero got a bit sluggish, so I had a bit of warning before it quit completely. Can't push start an auto!
Starter motor can actually last quite long depending on how it was treated, how many stop starts, and also if the mechanic had dumped diesel on it while changing the fuel filter can affect the lifetime of the unit. Maybe have it pulled to check on the carbon brushes and armature, mine were very clogged up with diesel/carbon gunk mix.
If you can swing a spanner it is an easy check, takes about an hour to pull and disassemble, check innards and put back.
I haven't had to look at that in my pajero yet, but my corsa Alternator started growling at me, so had to pull and strip the alternator to measure up for replacement bearings. I then had to repeat the process once I had them from Bearing man. The suppliers (diesel electric, auto electrical companies) unfortunately only work off samples, not part number which makes it a tedious process as you have to do everything twice, it is however also an easy but fiddly fix.
The diode pack can also just suddenly give up the ghost, bit of hit and miss with that with no prior warning.
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2005 Gen 3 Pajero 3.2 DiD Auto LWB
ARB front bumper, OME, Lynx Bash Plate, Lynx Rock-sliders, Lynx rear steel bumper, Front Runner 40lt Long range tank, Madman EMS2 with EGT, dual battery system, 700FF spots
Corsa 1.4 Club (swambo)
"In my house I'm the boss, my wife is just the decision maker." - Woody Allen