Added a small digital voltmeter to the Field Out and tested it out.
Ignition on: 9.2V huh
Getting it running at 2krpm: 4.1V WTF
Disconnecting the Alternator (the 2Pin connector)
Ignition on: 12.2V
Running at idle: 12.1V and slowly going down (since no charging).
And without the Alternator charging like mad the idle was much smoother.
Since this Altenator have behaved like this from brand spanking new, I'm wondering if there is something different in my harness/connection.
Again; should 1T
be left open/floating?
The previous Alternator with this behavior behaved as shorted when tested at the shop, so there is a chance that this one was shorted from new. I just want to make sure i have done the best I can I can before getting a new one.
The low voltage on the Field Out suggest to me that the Transistors in the circuit are doing their best with a really high load.
With main switch pulled the two pins have 17kOhm and 10kOhm to 12V but infinte and 0.4kOhm to ground.
A spare Alternator (new diode bridge but needs new 12V connection parts) have no connection to ground and 18kOhm and 0.9kOhm to 12V.
All measured grey before grey/red (1T and 1O).
Very crude tests but the 0.4kOhm to ground does not sound nice.
Back to the alternator service shop tomorrow morning then...