I changed the battery on our SC 430 about three months ago. Since then the care sometimes will not start (completely Dead). Once we jump the car everything is fine. This seems to happen about once a month (happened today to my wife). Any ideas of what may be causing this issue? We also had the struts replaced and the repair technician had an issue with the trunk not closing. Seems the emergency trunk release cable was stuck open. They got it working but I am wondering if the lock mechanism is fully engaging the trunk lid and not turning off the trunk lights when the trunk is closed. I will also check to ensure that the battery cables were tighented securely when they replaced the battery.

 

Does sound like you have a parasitic draw somewhere thats not constant (ie only draws the days that your cars been dead). Could be the trunk light, or it could be something else. Maybe the technician somehow loosened a ground wire somewhere? These issues can be difficult to trace sometimes.
I'd post in the SC430 section though, they may have more insight into this than us. This is completely the wrong section, its the 'SC300/400 Builds' section.

 

My mistake - First time in posting - thought I was in the SC 430 section. We found the problem - it was the terminal connection to the terminal post. Thanks for your insight.