Last week went to start the convertible - dead battery. It was over 10 years old, although no sign up to that point of any potential failure.
Swapped battery out of coupe to convertible, but had other things to do so did not drive it. Bought new battery for coupe.
Yesterday went to drive the convertible on a nice sunny day - dead battery. Very surprised since the battery out of coupe was 4 years old and fully charged.
Put the battery charger onto the battery, but after 24 hours when current should be down to maybe 0.5A battery was drawing over 2A. Remove battery clamp and with multimeter find battery is discharging 2.5A into car. No idea why, but switch on ignition without starting car and cycle it a few times. Still have 2.5A problem.
Don’t have the boot light switch that drains batteries, although not at 2.5A.
The other common problem mentioned on forum is the aerial. Notice that switching on ignition did not raise aerial, although battery is at 13.8V.
Remove inline fuse for aerial. Still have 2.5A draw. Mess around a bit with wiring around aerial, nothing conclusive. Put fuse back and now have no 2.5A draw.
Does not make sense, but took fuse out anyway just in case. Will check current draw again in a day or so, put fuse back and see if aerial deploys. A bit worried have not found a definite answer to the 2.5A draw.
2,5A at 13.8V is about 35W, and in the aerial motor that would be pretty hot.
Does not seem likely, did not feel hot.
Anybody had a similar situation ?