I've been having an issue for the past 3 months where car runs/drives perfectly, then out of nowhere the car will become "jerky" when accelerating and the transmission will shift rough. I noticed that when this occurs, my cabin lights will flicker so there must be some electrical component to this...

Video of intermittent cabin light flicker

Then yesterday, I was driving without issues and the car suddenly just about went dead. All my dash lights dimmed, the car lost power (was just able to idle but couldn't accelerate. Kind of went limp.). Also got a whole bunch of dash lights. I shifted into park and took a video. This is me revving the car, very sluggish....

Video of Dash Lights yesterday when car nearly died

At the time of this incident yesterday, it was dark and cold and I had been running headlights, stereo, both seat warmers... lots of load on electrical. Could be coincidence, but I shut the car off, waited, and started up twice. Both times the car was fine for a matter of seconds before sudden loss of power like in the above video. The third time, I shut off headlights, heat/fan, seat warmer, stereo and was able to drive it home ~1km without an issue.

I am thinking Alternator... anybody else with an experience like this?

 

Loosen and tighten all engine grounding wires first, then report back.

 

Already done. Connections are solid.
Also, alternator tested today and seems to be in great shape. 106 amps. Steady voltage from idle through rev

 

Did you have the battery tested as well when you tested the alternator? It almost just sounds like your battery is on its way out. If that checks out, I would start looking for water around the IPDM area.

 

Battery tested today and is good. Alternator replaced 2 years ago, Battery replaced 1 year ago. Both are Bosch, not a cheap brand.

Even when the car "loses power", I can turn it off and then cranks fine... no drained battery symptoms.

Thanks for the tip with IPDM. Will read up on that as I've never dealt with it before.

 

When did you do your double din, are all of the wires connected and are the grounds hooked up.

 

Double DIN was recent, which had me suspicious, but all grounds are connected and everything related to the double DIN works perfectly. (My understanding is that if the ground became disconnected, my deck would stay at a fixed volume or show some kind of error msg).

Followed Wrathernaut's Installation Guide exactly. Unless one of the modules used is faulty and could be causing such a large electrical issue..