battery cut off switch

danchapman2k2 · May 14, 2014

Due to me having a battery drain from something somewhere in the truck after investigating still no luck so have decided that I'm going to fit a battery isolator switch. I don't have central locking or a key fob but have an immobiliser what my question is is that I know the immobiliser won't work but when I turn her back on and give power to the truck will it make my immobiliser play stupid.

If so does anyone have any idea on how I find this very slow power drain it takes 2 weeks and the battery is flat enough not to start 30 sec on boost and it starts

Brian S · May 15, 2014

Have you tried a new battery?

danchapman2k2 · May 15, 2014

Brian the battery is brand new mate

trax · May 15, 2014

danchapman2k2 said:
Brian the battery is brand new mate

you named your battery brian? :der:

danchapman2k2 · May 15, 2014

Buz · May 15, 2014

Try removing the fuses and see what happens. Then if all ok, start replacing them a couple at a time, long drawn out affair but may pinpoint what circuit is drawing the current.

Brian S · May 15, 2014

trax said:
you named your battery brian? :der:

Ahhhhh that's nice. My wife calls me Duracell as I keep going and going and going and going.

landowner · May 15, 2014

Take earth off battery and put multimeter from earth lead to ground.

It should show a power drain however slight.

remove fuses/relays one by one until the drain stops

did this on an old pug and it was the headlamp relay

discool · May 15, 2014

Buz said:
Try removing the fuses and see what happens. Then if all ok, start replacing them a couple at a time, long drawn out affair but may pinpoint what circuit is drawing the current.

Surely you would only need to remove fusses the are on a live permanent supply and not switched, which there are few, such as lighting plus circuits which are live via ignition switched.

Buz · May 15, 2014

discool said:
Surely you would only need to remove fusses the are on a live permanent supply and not switched, which there are few, such as lighting plus circuits which are live via ignition switched.

In theory yes, but if there's a faulty relay then it could be stuck drawing current even though the ignition is off?

discool · May 15, 2014

danchapman2k2 said:
Due to me having a battery drain from something somewhere in the truck after investigating still no luck so have decided that I'm going to fit a battery isolator switch. I don't have central locking or a key fob but have an immobiliser what my question is is that I know the immobiliser won't work but when I turn her back on and give power to the truck will it make my immobiliser play stupid.

If so does anyone have any idea on how I find this very slow power drain it takes 2 weeks and the battery is flat enough not to start 30 sec on boost and it starts

How do u know u don't have central locking? It's part of your vehicles security ECU, immobiliser, alarm and central locking.

So how many milliamps do u have draining from your battery in its quiescent state and what is the batteries voltage after two weeks??

Have u checked the usual suspect "earths"?

battery cut off switch

danchapman2k2

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Brian S

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danchapman2k2

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trax

.

danchapman2k2

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Buz

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Brian S

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landowner

Pensioner Pete

discool

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Buz

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discool

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