I posted last week when the remote had stopped working. Had the car electrician over today and he has found that the radio/SatNav circuit had been drawing power, which caused the flat batts each morning. The fuse itself is not necessarily fault, but shorts as a protection against if an error has occurred in either the rado or the SatNav. Do any of you know what the problem is likely to be in a 75 Tourer 2.5 V6 automatic (04)?
The likely problem is as already mentioned damp or incorrect shutdown. However I think the guys description of the fuse shorting if an error occurs is way off. A fuse IS a short circuit all the time. If it ever stops being a short circuit, that's when your fuse has 'gone'.
Gents, you may well be right about water ingress around SatNav. I found a small amount of wetness there which may or may not explain original battery drain. We have taken SatNav out, once it is dried out inside will reconnect and see if it will work. May I ask another question please? I assume water is getting in via the tail light, so do you suggest a sealant or something else?