Bollox, I have a feeling that could be the Clifford Alarm that got fucked up every time it rained as the water run thru the bonnet vents and straight into the alarm unit, but if its not that.. it will take ages to find the reason wouldnt it??!
what is the alarm unit doing under a bonnet vent
battery drains are nightmare to find on cars like this sometimes, usually an interior/boot light stays on
