The Nissan Path

I started up my 1997 Nissan Pathfinder SE today and three lights came on and stayed on. The a/t oil temp, brake, and battery lights. I've asked a couple people and they said it's probably something electrical. I checked the tranny fluid and brake fluid and they were fine. I checked the oil, it was low, I added more but none of the lights went off. I checked the fuses and they were fine. I went to Autozone and got the battery, alternator, and starter checked and they were all apparently ok. Does anyone know what would cause all three lights to come on at the same time? It does have high mileage, about 221k.

Usually when that occurs, it's a charging system issue. Did they test it with loads "on?" If the charging system is charging properly, I would have all systems checked for codes (engine, bcm, integrated meter assy., etc.). This would need to be done by a scantool, not the code reader used by parts stores like Autozone.

It was the alternator, thanks.