If the alternator really is original, then I suggest changing it ASAP. It could fail without warning (I have had this happen). The alternator idiot light does not always give a heads up warning.
Be sure to do the gauge cluster solder repair too. The charging circuit goes through the gauge cluster. Also, I have added a voltmeter to both of my 94 940s to keep an eye on the power.
Battery age?
Replace any old coolant hoses with new genuine Volvo hoses. They can fail without warning. Radiator OK? Original? If so, consider changing it too.
Belts OK. Carry spares.
Exhaust solid? Exhaust holes can give warning... Or a rusted joint could just drop.
Keep back up ECUs in the car.
CPS original? If so, I'd consider swapping that. If it fails you will be dead in the water.
There are a few other relays that if they fail will stop the car (no ignition)... I have to look up my repair paperwork to check. I'd replace them or carry backups.
How old is the fuel filter?
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