Dead Battery?
Thread Starter
Pro
Joined: Mar 2008
Posts: 568
Likes: 11
From: Bobcaygeon Ontario
Dead Battery?
2015 Z07 M7. Electrical completely dead. Replaced battery with brand new one, higher spec than original and still nothing. Not even an interior light. Not even a click when I push starter button, checked all connections can't get anything even using battery booster! Any thoughts please?
Burning Brakes
Joined: Aug 2009
Posts: 1,021
Likes: 260
From: Sturgeon County Alberta
make sure the battery connections are secure. Lots of threads were guys are having issues and they didnt have the cables secured properly. If youre sure the connections are good, and battery is charged, then i would check some main fuses. The fact that boosting made no difference could mean the posts are tightened properly.... keep us up to date on what you find.
Burning Brakes
Joined: Feb 2010
Posts: 878
Likes: 61
From: Louisa, Ky
Voltage drop diagnosis done with meter starting at the battery. Place meter leads at each side of a connection( example would be battery post and cable lug while connected) Good connection no voltage on meter, bad connection will show voltage, continue with positive lead side when you finish with ground side. A long jumper can help get to the alternator and feeds to each fuse box starter and so on. The positive side and all those connections mentioned should be as one with no volts showing on meter. The neg side should also show no voltage drop all the way to frame. With a known good battery and small steps you should be able to isolate where the open is located. There may be a battery relay ill check the book. A test light can also help first at battery neg and positive then move out to the lugs then frame for ground side and all those positive side connections all showing voltage to light the test light. Some times a bad connection will isolate itself when heavier currant is asked for and not show with sensitive meter or test light so would be best to turn lights on while looking for the open even if they do not come on------ hope this gives you some where to start!
Burning Brakes
Joined: Feb 2010
Posts: 878
Likes: 61
From: Louisa, Ky
No battery relay but the first place it goes is to a 350 amp fuse near the battery in the truck fuse area then on to the underhood fuse blocks
Last edited by Jim Barker; Dec 29, 2018 at 09:41 PM. Reason: addition
Burning Brakes
Joined: Feb 2010
Posts: 878
Likes: 61
From: Louisa, Ky
There is so much connected to the positive post of the battery make sure while changing the battery nothing was left loose from the connection plate fuse box there at the battery plus fuse is good
Last edited by Jim Barker; Dec 29, 2018 at 10:07 PM.
Thread Starter
Pro
Joined: Mar 2008
Posts: 568
Likes: 11
From: Bobcaygeon Ontario
Thank you for all the info. I'll check everything this morning. The whole car is dead even though the battery shows fully charged. It's like there is a an open fuse but I'm not sure what may have happened to cause that....
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Thread Starter
Pro
Joined: Mar 2008
Posts: 568
Likes: 11
From: Bobcaygeon Ontario
Thank you gents for all the help. I guess something was loose so I loosened of all the connections and then re-tightened everything. All is good now. Vegas 1500 mentioned that something could be loose but i thought that I had everything tight. Apparently not. Funny thing though before I did this, I took Jim Barker's advice and opened the hood to check the fuse box there. As soon as I opened the hood, the door chimes started to go off and my hazard lights flashed for a few seconds. Still nothing on dash until I re-tightened all battery connections. Engine then started with no issue. Plugged Corvette battery maintainer back in and tucked my baby in it's cover. Just waiting for warmer days now. Thank you again guys.
Last edited by roysvette; Dec 30, 2018 at 08:01 AM.