Just the OBD wireless connect.

After last battery disconnect/reconnect, everything works. Solution for now is a C-Tek MXS 5.0 This seems to be the replace for the 3300. I'll disconnect the battery when it's in the shed (no power) for more than a couple of days (the time it's taken to drain to 12.4). Do window reset, ECM for 2 mins. Will I lose the seat memory?

Doing connect/disconnect when my 06 XK8 is in storage. I was hesitant to do on a 1-2 week basis but no problems for the past 2 months. Reset is simple. AGM battery steady 12.8. After a year of drains, no longer charges to 13.1. May hook to C-tek and see if that helps. Car always starts.

 

. That's the problem!

 

Yep... unplug it, and then do a battery disconnect and reconnect again!

 

Thanks for the disconnect suggest. Improved to 13.1>12.5 over 5 days. Double click, info totally off, stereo off, headlights set to off. Full parasitic drain test next.

Drove the car 40 miles. Battery still 12.5. OBD charging shows 14.2-14.7. No warning messages. No codes. Checked voltage at terminals w/ car idling. It's 14.4 However, overnight charge w/ C-tek (4.3A max) and get 13.1. How can trickle charging work (12 hours) when driving 40 miles (1.5 hours) doesn't? Ac on, stereo on. Does it make sense to replace a 1 yr old high quality battery (done by PO) that trickle charges to full voltage?

 

Charging at 14.7 volts seems a bit high for a 'new and good' battery. I'd think there is a bad connection somewhere, either a ground point or maybe the battery cables on either end?