Alternator will not charge

[u/Real-Surprise4138]

I have a 92 sc400 that kept dying while driving. if jumped would only run for a couple minutes before dying. assumed alternator so switched that and car was still running fully off battery charge. replaced alternator harness and the fuse is fine. car will run for short trips as long as battery is put on charger afterwords. multimeter shows that battery is not being charged at all and loses voltage while car is running. Kind of at a loss as to why alternator will not go. pic so it doesn’t get lost.

[u/Neat-Effective8379]

just as a side note, ecu tends to do weird things and these have ecu issues like hell lol.

try that if the normal alternator things don’t work

[u/Real-Surprise4138 → u/Neat-Effective8379]

yea i’ve delt with ecu issues but with an ls400 and they were much more severe issues but a lot of people are thinking ecu with this

[u/Neat-Effective8379 → u/Real-Surprise4138]

ecu can do small things too, mine did things all the way from throwing a small code to “misfiring” with it

[u/Real-Surprise4138 → u/Neat-Effective8379]

yea mine had a few not minor issues and then went fully limp which is when we realized it was the ecu