97 s14 charging issues

[starfireS14]

Ok i replaced alternator less than 5 mths ago battery and brake light come on while im driving. I tested the battery its good but the alternator is only putting out 13.75 to 13.89 charge so because its under 14 the dash lights are on is this a problem with the alternator or could it be a fuse issue i checked all fuses which turn out to be good. If so how long can i drive with low charge. Im swapping in SR in about a month.

[Rev_D21]

13.75-13.89 is still good and still charging. Check that the amperage is good though. Surface voltage is one thing, amperage is what drives things.

[NISTECH]

the dash lights come on usually due to a diode failure. if your dash lights are comin on I would say you dont have long before the battery goes dead. especially if driving at night. like rev said if the ampreage isnt there it will not charge. have the car running and do the voltage test you already did except this time turn on your headlights high beams, a/c with blower on high, rear defroster and hazard lights. if your voltage is below 12 you need to replace the altenator.