2005-2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.

MSD cops=battery killers?

Old 08-02-2012, 08:08 PM
1st Gear Member
Thread Starter
Boogiestang's Avatar
Join Date: May 2009
Location: North Carolina
Posts: 56
Default MSD cops=battery killers?

I have a 05GT will all the usual bolt on upgrades and a tune from Brenspeed. I recently installed the MSD cops and now after the car sits more than 2 days the battery is dead so obviously something is pulling the battery down. I have used MSD ignition parts for 20plus years and have had good success with them but now I am beginning to wonder. Yes I do like the faster starting(when battery is charged) and cleaner running but this having to jump it off everytime is not gonna get it. The car is not a daily driver but it is driven most weekends and sometimes during the week on nice days. I did pull the negative off tonight for a couple minutes to maybe let the system reset but didnot have time to jump it off. I sure would hate to put the stock cops back on but I might have to. Anyone else have this experience with yours or can you give me some input on what to do? Thanks. Boogie
Boogiestang is offline  
Old 08-02-2012, 08:12 PM
2nd Gear Member
Tygr1's Avatar
Join Date: May 2007
Location: TX
Posts: 174

How old is the battery?
Tygr1 is offline  
Old 08-02-2012, 08:25 PM
1st Gear Member
Thread Starter
Boogiestang's Avatar
Join Date: May 2009
Location: North Carolina
Posts: 56

Around 1 year old and it is rated higher than the stock battery so I doubt that it is the problem. Everything was fine until I did the MSD swap. Once the car runs awhile it will restart fine so that tells me the charging system is ok and the battery is fine. Kind of weird I know.
Boogiestang is offline  
Old 08-02-2012, 08:34 PM
3rd Gear Member
obxdude018's Avatar
Join Date: Jul 2009
Location: Garner NC
Posts: 765

There will probably be a lot more educated people than me to chime in about aftermarket COP's, but from what I have heard and read, they seem to cause more headaches than anything else and that sticking with the stock ones is a more logic choice.
obxdude018 is offline  
Old 08-02-2012, 08:36 PM
1st Gear Member
BigIron22's Avatar
Join Date: Dec 2006
Location: Hudson, FL
Posts: 129

I would still have the battery checked! My stock battery died, I got a replacement and that replacement died a year later. Sometimes new parts fail early.
BigIron22 is offline  
Old 08-02-2012, 08:37 PM
3rd Gear Member
DRock's Avatar
Join Date: Sep 2009
Location: Cali
Posts: 702

go over the install again and check that everything is hooked up properly and tight
DRock is offline  
Old 08-02-2012, 08:52 PM
1st Gear Member
Thread Starter
Boogiestang's Avatar
Join Date: May 2009
Location: North Carolina
Posts: 56

Battery could be going,,very possible. I will pull it and have it checked but I still find it ironic that this started happening right after the coil change over. Hey good thing I kept the stock coils just in case. Sure hate to was $380 dollars on nothing but problems.
Boogiestang is offline  
Old 08-02-2012, 08:55 PM
4th Gear Member
danzcool's Avatar
Join Date: Oct 2008
Location: CA
Posts: 1,961

If it's hte original battery, it's probably outlived it's life. Otherwise there are other known issues that can cause battery drain, including a failing alternator or and issue with the shaker head unit.
Best bet is to take the battery in to be tested (autozone or elsewhere), they can let you know whether it's simply discharged or going dead at no charge, also they can test the alternator. My best guess is it's just coincidence... but it's also known that the stock COPs are the most reliable.
danzcool is offline  
Old 08-03-2012, 03:12 AM
6th Gear Member
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278

Ever hear of a coincidence? That's what you have here. I have msd cops and don't drive my car every day. My battery would die from sitting for 5-6 days and that was with the stock cops.

I'm on my third battery. Stock lasted 3 years, autozone battery lasted 3 years. The one from O'reily's has been the best so far.
moosestang is offline  
Old 08-03-2012, 04:13 PM
5th Gear Member
Join Date: Mar 2007
Location: Elizabeth City N.C.
Posts: 2,790

I've had the MSD cops for many years with no problem at all. In fact they shouldn't be a cause for the battery to drain anyways. You probably have a battery issue, alternator issue, or some other drain in the system. My guess is that it is the battery.
americaniron is offline  

Thread Tools
Search this Thread
Quick Reply: MSD cops=battery killers?

Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.