Welcome to the forums.

This post/thread has been moved from Car Talk to the model specific forum for better response.

 

Yup HFL

 

 

Seriously? Not sure where you heard that but if the HFL is unplugged, there is no way on this earth it was consuming power from the car's battery. Whatever idiot told you that should be ignored,

 

 

 

Ummm, no, physically impossible for the HFL to draw power when it is unplugged. Simple fact of life.

 

Yes, there was a class-action lawsuit with the HFL issue. I don't know what the outcome was, or if there even was an outcome. Either way, pulling the fuse or unplugging the HFL will fix it. It obviously can't continue to draw power from the battery if it's unplugged. That would be like your vacuum running after you unplug it from the electrical socket. That's some new technology there! Well, actually, they have "wireless charging" for phones I believe, but not yet continuous high-wattage wireless power. Maybe we'll get there one day It would be like wi-fi but for power!

 

Is the battery healthy? If it's died several times, it could be sulfated which reduces output considerably. It's bad to let lead-acid batteries die. It can shorten their life very quickly.

 

Here's a thought: it could be something else drawing power IN ADDITION to the HFL..

time to break out the multimeter and start a parasitic draw test :

 

 

Could be..

OR could be this.. :

 

Your option is to get the issue properly diagnosed and stop throwing money and parts at an undiagnosed problem.

 

 

Here's the thing, how much have you already spent in repairs which ended up not fixing the issue? If you are unable to use a multimeter to figure out the source of the problem, then spending $150 on a diagnosis is cheap compared to buying and installing a bunch more parts.