I've been investigating a dark current drain that caused me to pull the permanent 12v fuse about 5 or 6 years ago as a "temporary" fix. It isn't as drastic as it sounds as the MX5 ECU is as basic as they come so it doesn't really lose any settings and the only noticeable effect to the driver is a lack of radio and interior light.
I'd always suspected the duff dealer fit alarm that used to go off every time I reconnected the battery. Well, for the last couple of years the alarm hasn't gone off when reconnecting the battery so assuming that the thing had finally packed up for good I decided to take another look at it.
I really wanted to check the drain properly instead of just throwing the fuse in and I wanted to leave it all connected for a few days and check it periodically. The battery is in a bit of an awkward place to check the current so I hooked up a couple of piddly little croc leads I found lying around. All being well I'd only be drawing mA's so should be fine...
Anyway, a couple of days of consistently seeing 9mA I was happy. So, I start doing a few checks in preparation for the MOT. Sidelights, all good, headlights.... Dash goes dark and one pop up pathetically half raises. Damn it, the battery must have drained after all. Ah... I've still got everything hooked up via that croc lead!
. One rather hot wire removed, battery hooked up properly and all was well!
It's now sat connected to my refitted CTEK quick connector, which could do with being about 10cm longer to clear the battery cover, and my new 2m CTEK extension lead. Will mean that I can easily leave it hooked up all the time in the garage and can disconnect in seconds and be on my way.
Next job is a polish of the outside and a deep clean of the interior fabrics. I forgot to put a dehumidifier in when I laid it up. There was a bit of mould in the usual places (steering wheel, sun visors) plus some on the inside of the roof. I got rid of the bulk of it but it feels a bit too much of a health hazard to want to drive it like that!
Then it's fingers crossed for 5th September for the MOT.