This is pissing me off to no end.

I have a bad battery drain on my Cosworth, I can drive the car all day with my SECS monitor showing the battery voltage between 13.3 to 13.8 volts. Leave it over night and try and start it on the morning and its not got enough charge to turn the car over.

When the engine is running, I have tested the voltage of the battery and it gets to around 14 volts at its peak.

I have just rewired the large alternator feed and added a new 10mm earth to the engine (using one of the engine eye lifters for a fixing point) to the battery as previously I was only charging at 12.9 - 13.1 volts on the SECS.

Fuel pumps have been both rewired using 6mm cable and use the correct relays etc.

Now I'm getting stressed out with this. None of my lights are staying on to cause a drain, but yet I am getting a drain.

Any ideas where else I might be having a problem?????

And any ideas on how to potentially reduce or eliminate the problem??

I have been thinking of putting in a battery isolator etc, but that's a last resort as I shouldn't need to do that as the car gets used often.

Any help/advice gladfully received

 

disconnect the earth from the battery, and place a multimeter between the cables, and battery....switch to amps on your meter....take a reading....


gradually unplug things, remove fuses untill you find out which makes the reading drop.... that will be your drain,


make sure your interior light is off when you open doors etc going through the meter, and dont try to run it....just a low amp check....

 

Tom you knob. Why haven't you rung me about this if it's been getting pretty bad?

 

I'll ring you later hun

 

Has the battery been left to go flat recently? sometimes they just wont hold a charge if they are getting tired?

 

alarm?

 

sounds like the good old faithfull fan sensor switch on the bottom of the rad. think everone incurs this problem at one stage of ford ownership. at Ł8 its worth changing even if it isnt it.

 

TiB:-

Battery has not been less than 11v (hopefully!!) and is only a copule of months old.

ESCYSCOTT:-

My alarm is a bone of contention, and it is going to get checked over sometime this week hopefully

S3an

I have played around with this as the wiring was all corroded and nasty, but I will check it out further just incase

 

If its a clifford then yes thats your problem

Trackers also use a bit if not driven on a regular basis

Paul