Originally Posted by Cm644rodrigues
As driving my 87 today in third and Roma dropped off to zero amp light and batt light came on so I pulled off and checked batt connections and alt connections. Everything was fine. Car started right up and I continued on til I got home. This came out of the blue. What's going on is my alt dying?
Sounds like the alternator quit charging.
If you have a voltage tester and the car will still start, hook up the tester to the battery and start the engine. Make sure it is in park or neutral as required and the e-brake is set.
Right after startup your voltage should be around 14 -14.5 volts and after it has run a bit it may drop off to 12.5 - 13.5. That shows you the alternator is charging. If it doesn't, then the alt is not working or the voltage regulator has failed.