"bambi1001" <none.DeleteThis@000.com> wrote in message
news:997003_565f5c169a6e5760df55880105f4c355@autoboardz.com...
> my hubby has a 2004 tdci 1.8 ghia focus, he works away for two weeks
> at a time and when he comes back the battery is flat
> we had a auto electrician look at it and nothing obvious was showing ,
> the alarm and immobilisor are on all the time he is away , would they
> drain the battery ?????
> this is the second new battery in as many months , the alternator
> seems to be charging ok ,it starts every day when he is home after the
> initial starting with battery boost pack
>
> any help would be appreciated ...thanks
>
You have a parasitic drain and most likely it is caused by your alarm. Try
hooking the fcar up to maintainer while he is away on his trips. It will
keep the battery fresh and is alot cheaper than buying a new battery every
few months. Easiest thing to do though would be to just put a quick
disconnect on the battery so that when he leaves, he can quickly disconnect
it and no problems when he gets home.
To check for parasitic drain, get a Digital Volt Meter that also measures
Amps. With the DVOM set to measure Amps (A=) and with the key off, take the
negative battery cable loose. Put one lead on the negative battery terminal,
and touch the other lead to the negative cable, or the engine block. If that
meter reads over 50mA (mA=MilliAmps) or .05Amps then the drain is too high,
and you need to disconnect the battery for long sitting periods. It doesnt
take much to drain a battery completely with a decent drain on it, but it
takes 100Ah (amp hours) to charge a battery back up to full capacity. Thats
charging 1 amp for 100hrs. So if you have a 5amp charger it would take 20hrs
to charge a battery back up to full capacity.
Hope this helps...
Ford Tech
>> Stay informed about: ford focus battery problem