Hello does anyone have issues with car battery completely drain within couple of days? To prevent that from happening, I have to disconnect the negative battery cable. I have a 2005 Ford mustang 4.0 v6.

 

To drain a charged battery in several days time requires a current drain of at least 5 amps, probably more. That current is going SOMEWHERE.......a failed shut-off relay for lights left on, doors left open, etc. will do this. If not lights, which pose no safety risk, such current flowing into a short-circuit situation through some accessory DOES pose risk: chance of fire. Make sure no lights are on: connecting an ammeter in series with the battery can allow removal of fuses one by one, while watching for the drain to stop. Finding it, look at fuse purpose listing, then the offending part.

 

Thanks for your reply. I'll check it out.

 

I just fought this same issue for a month.
I did find out that the Shaker 500 CD player tends to keep trying to load a CD after car is shut off.
# 1 do you have aftermarket electronics installed?

# 2 If you have a VOM meter with 10Amp function you can do a drain test & start pulling fuses. FORD service manual says you should get no more than 50ma after everything cycles down 1-3 minutes,
I was getting 150-200 ma but not always. There are YouTube videos on how to do the drain test. or I can send it to you

# 3 My problem turned out to be a bad backup camera that mice had chewed the wires, plus I had removed the RAXIOM radio and
installed a Kenwood DNC 467s. the Maestro interface was not compatible with my 2006, the pre-amp was not shutting off.
Good luck

 

If I ever have a battery drain problem again, I will always just go to the battery drain test first, check aftermarket stuff first then pull one fuse at a time while monitoring drain amps.
This is even what the dealers do.
You have to have key off and all doors shut, then wait a few minutes till everything cycles off as you will get high readings for a few minutes.
KenK

 

Hi;
I made a battery drain tester, so I could hook up my ammeter first then open the negative circuit without having to wait for everything to cycle down.
There are a few on eBay, but they were a week out, so I made my own.
KenK

 

I also heard that simply leaving the radio turned on when shutting off the ignition leads to battery drain. I bought an 06 GT and the seller hardly drove the car but said he had to jump start it every time. I researched and found this information...always turn the radio off and eject all CDs before turning off the ignition. I never once had to jump my car after following those rules.

 

Well I think my son drove my car while I was out of town and he left the radio on and the battery was dead when I tried to start it. I think I am going to buy an emergency Jump Starter but I don't now what mAh I definitely need as that seems to drive the price on these. $80 on Amazon for a 2200A Peak 21800mAh version or $50 for 1500A Peak 12800mAh.

I don't want to be cheap and save $30 for something that is not going to get me started. Anyone care to chime in on what is the minimum that will safely get me started when I need it.

Any recommendations for a particular brand/model?

Thanks

 

Couple things. 21800 mAh is 21,800 milliampere-hours, or 21.8 Amperes, barely enough to jiggle the start solenoid. a 2200 A source sounds humongous. If it were me, I would re-wire such that the damned sound equipment is OFF when not in use.

 

I don't know how to do that (re-wire the system). A friend suggested a cutoff switch installed to basically kill the battery every time I exit the vehicle. Not sure how to do that and the ramifications, would I simply lose my preset radio stations each time I did that? And what else is lost by "killing" the battery with the use of a cutoff switch to stop the drain issue?