Clattery when cold
Join Date: Feb 2012
Location: United Kingdom
County: Greater London
If you have an ammeter, set it to approx 1A range initially and connect it in series with the +'ve battery terminal with everything turned off, doors closed & locked etc. If you have a drain it will show up as a value.
ie ---loom---[+ bat connector]--------(ammeter)--------[+ve battery post]
There is bound to be some baseline drain by the alarm/immobiliser unless you can disable it, but that should be a low value. I don't know what on AR's but 50mA (0.05A) or less is pretty typical for most vehicle systems. If it's considerably higher something ain't right.
Then it's a matter of repeating the above whilst pulling one fuse at a time from the fuse panel until the extra drain no longer occurs. This will localise the circuit that is causing the drain.
Thereafter it's a matter of trying to find which component in that circuit is drawing current when it shouldn't be, using the meter as a resistance meter to try and spot measureable resistances between permanent (not switched) live feed side of the component and earth where there should be open circuit.