Battery Keeps Draining

[Ghost11]

For some reason the battery in my Cobra keeps draining..

I had my battery checked it turned out fine.

If I fully charge my battery and drive the car for a hour or so
you can feel the car starting to lose power.Last time it actually
died at the stop light,Dead Battery again....

Bad Alternator?

It does have a aftermarket Stereo/Power Amp/Security System if
that matters.....

Any idea?

 

[Fury327]

Find out what voltage you have on the battery with the car running.

 

[JuStAkId]

Find out what voltage you have on the battery with the car running.

x2

I have this and it works well.
Actron/Battery load tester (CP7612) | Alternator and Battery Tester | AutoZone.com
Also I have the torque pro app and that reads it as well
Both read the same

 

[X3FBrian]

Mine has been doing that for awhile. Good luck finding it. I gave up.

 

[Monster Mach]

Well if u fully charge the car and it dies that's the alt not charging it back up. Check for belt slip and get a good alt now

 

[Ghost11]

Well if u fully charge the car and it dies that's the alt not charging it back up. Check for belt slip and get a good alt now

Let's say it is the Alt....

Where should I purchase a new one?Do I want a beefed up one?

 

[Monster Mach]

Let's say it is the Alt....

Where should I purchase a new one?Do I want a beefed up one?

I would google mechman alt ( he is by far the best in the business) tell him it's for a car that eat alts which cobras do. Made to spin shit out of them. You pay a bit steeper of a price but you get a piece your not going to have to replace like the remans and give you enough juice to do whatever you like

 

[JuStAkId]

http://www.svtperformance.com/forum...t-n-charge-alternators-03-04-only-please.html

 

[cobracide]

Get the voltage reading, if your alt is bad the voltage will be low 12's or worse. Underspin the stock alternator with a larger pulley.

 

[gnatsumarboc03]

I vote alternator...have your battery light came on anytime recently? Did your abs light come on before it died?

 

[Emwun Garand]

You might be drawing too much power at idle and the alt can't keep up. Could try a smaller alternator pulley to increase the belt speed at idle.

Also, check to make sure all of your grounds are good. I'm chasing down electrical gremlins right now myself and I discovered a hack job of wiring that the last shop to work on my car left me.

 

[X3FBrian]

Small alternator pulley? That's the worst advice I've ever heard. If anything put a bigger alternator pulley on to prevent your alternator from crapping out.

OP, my car is doing the same thing and I've put a 170 amp alternator, larger pulley and a new battery and it's still doing it.

Do a parasitic draw test before throwing money at a problem that can be a number of different things.

 

[badazzebz06]

my brand new alternator ford oem took a shit at 1500 miles 13 months and it has a metco 3.5 pulley...those turds at ford wouldnt give me a new one cause its only a 12 month warranty lol anyway it sounds like your alternator....replace the alternator and while you are putting in the fresh one either buy a new battery or charge the current one to 100% with a battery tender

 

[Tractionless1]

I would google mechman alt ( he is by far the best in the business) tell him it's for a car that eat alts which cobras do. Made to spin shit out of them. You pay a bit steeper of a price but you get a piece your not going to have to replace like the remans and give you enough juice to do whatever you like

+1 and I speak from experience. You want a billet tech and at least 180 amp.

 

[04Mach1Blurr]

I had the same issue. My specific cars problem was a breaking wire from the connector harness to the alternator itself. One of the wires was broken which didn't allow the recharging system to work properly. I found this out after 3 brand new batteries and 3 alternators. I also finally went with a PA upgraded Alternator with the larger pulley to slow its rotation down during higher rpms. I also put a motorcraft battery in as well as a new belt. Once I got the wire on the connector harness figured out, my car is excellent now.

I also have an aftermarket subwoofer system and amp, as well as remote start and security system. None of that mattered.

 

[START 'N CHARGE]

I had the same issue. My specific cars problem was a breaking wire from the connector harness to the alternator itself. One of the wires was broken which didn't allow the recharging system to work properly. I found this out after 3 brand new batteries and 3 alternators.

Your not the first to have a connector problem.Was it at the plug itself or further up the harness?

 

[04Mach1Blurr]

Your not the first to have a connector problem.Was it at the plug itself or further up the harness?

It was right where the pin goes into the connector. It needed to be re-pinned