MKZ Hybrid 12v Battery Discharge

budpytko

Registered
Anyone with a Z -Hybrid had a problem having the 12v battery holding a charge? I've been fighting mine holding a good charge longer than 36 hours. It has something drawing it down but can not figure out what it is. All I have is a standard VOM...it's not a cheapo but with the new electronics you can not just start pulling fuses one by one anymore. The other prob is my body can't get into the positions to get to the fuse box behind the dash. I can see it, but can't see it and reach it at same time. It's really hidden.. Prob will have tp take it back to the Lincoln dealer. Yes, the battery has been tested. It's less than a year old and I did have it tested.
 

tixer

Lincoln Evangelist
Staff member
Paid Member
Hey, Bud.

You'd really need at least an ammeter to track that down effectively. I actually have a similar leak on the Mark that I've been meaning to track down, but "solved" it the lazy way instead with a Trickle Charger.. :)

I saw a video recently on tracing/diagnosing a voltage leak. It's not a Lincoln, but worth a watch. It'll at least let you know what you're in for.

 

budpytko

Registered
Great vid but of NO use for me. The car was too old. On my Z if you open a door, hood or trunk the keep alive circuit springs to life and you see a LOT of current draw. I can fake the truck and doors in closed state by popping the latch to closed position but haven't found the cure for the hood yet. Guess where the main fuse box is ? As far as the passenger compartment fuse panel goes , it is stuck up behind the dash so far that I physically can not reach it and put meter leads up there at the same time. And I'd need to do that to see current draw on each fuse.
But after watching what happens to these new cars and when the car "goes to sleep" I found that in order for it to go to sleep in 15 min to an hour, you gotta lock the car, then hit the lock button on the key fob TWICE. The horn will beep ONCE. Did this 2 nights in a row and had no prob starting it next day. Too make sure that that was the only issue, I'll try for 2 nights in a row. Stay tuned.
 

driller

El Presidente
Staff member
Paid Member
But after watching what happens to these new cars and when the car "goes to sleep" I found that in order for it to go to sleep in 15 min to an hour, you gotta lock the car, then hit the lock button on the key fob TWICE. The horn will beep ONCE. Did this 2 nights in a row and had no prob starting it next day.

Interesting.

I think I actually accidentally did that to our Navigator once.

The reason I suspected as much is because the remote start refused to function. Then after manually starting it, the remote start magically worked again.
 

tixer

Lincoln Evangelist
Staff member
Paid Member
Man.. that passenger fuse panel location is as lousy as they come. Sorry to hear about that. I think the trick with the video was that he also had a logging oscilloscope to work with, so he could watch the current draw over time.

I do think you're onto something with the door locks though. There's probably all kinds of systems the car keeps "awake," just in case you come back. It really is a super complex car. I'll be looking forward to updates!
 

budpytko

Registered
The car started normally this afternoon. It had set about 38 hours or more,.. It previously had only sat 24-30 hours when the battery had failed to do anything. Had to open it with the key that's hidden inside the key FOB. I will surely remember from now on to lock the car with the FOB, beep once. Next time I'm at my Lincoln dealer I will question them on this.
 

BlackIceLSC

Registered
Do you have the power trunk lid? It is a known issue with them that it will continue to draw power after closing (the pull down motor). If so, that's where I'd start as it is a common problem. The fix is 1 of 2 things: Either a reflash of the module itself, or it may require replacement and then programming. You should consider joining the Facebook MKZ enthusuasts community page. There are CONSTANT bits of shared info.
 
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