is an interesting read.
It's my understanding that battery power alone starts the car, once started, the alternator comes onto play to power other electrical systems and to keep the battery charged up to its optimum. Output from alternator should be between 13.8v & 14.5v.
As you have a new alt and it's giving the same readings as the old one, I'd now be taking a wild guess that you could be seeing a 19v output from the alt due to it not seeing a what it expects to be seeing and therefore being unable to regulate it's output?? Does that sound even feasible??
You may well find that replacing the relay fixes the issue
Just my 2c
most charge system works like you start the car... the alternator start tp pruduse power to the battery... the alternator is labeld 90A 19V.
But on the alternator it is a charge relay (or what it called in english... mounted on the back of the alternator.. the task for that is to reduce power from 19V too accepted around 14 volts.
on these cars we also have a crach cut-out relay to shut down current between alternator and battery if something happends.
In my case the crach cut-out relay is broken, soo i dont have any connection between alternator and battery.
Is it possible that if relay is broken and the alternator has no conntection to batter i can destroy the thing that is mounted on the back of the alternator soo instead of sending out 14 volt it sends out 19V.
if thats the case i have to first change the crash cut-out relay and then change the thing on the back of the alternator.. or maybe i will have the same problem again.
i dont know if a spinning alternator can take damage if its not connected to a battery.. (broken crash cut-out relay).
I meen in my ears a alternator should have something at the end of the cabels that force the alternator to work.. otherwise it just puching current strait out in the air without any resistance.
A alternator needs resistance or it can broke down..
Im from sweden and not that good at english, soo i hope you guys understand what i meen.