If your 4 seater has the same modules as per my 2007 2 seater.
In addition to the PCB assembly behind the switches there are two modules
MEE 3360 Dash control module
MDE 4001 Dash switch module
Over the last few years I have had an issue where at times the fuel gauge and the temperature gauge don't work, the problem sometimes lasted for a day or two. initially it tended to occur when driving through very heavy rain, more recently it has occurred even when it is dry. Strangely the problem has always started when over the other side of the channel, although it has then continued back in the UK.
I did cover the modules with plastic sheets to make sure any rainwater was deflected away from the modules, and from the switch PCB, I also tried to stop water ingress, with some success, but not 100%
A few weeks ago, while over in Brittany, in very hot, dry, weather the gauges failed once more, I think that in the MEE 3360 there is a stabilised power supply for the fuel and temperature gauge, when ignition is turned on there is a delay and then the voltage ramps up to the working level. This supply doesn't get to the right level when the gauges don't work
I have looked at the MEE 3360 PCB under a microscope, I found some whiskers of solder floating around, but clearing those didn't improve the problem. I haven't tried any invasive diagnostic for fear of making the problem worse
I have just purchased a replacement module from MMC (via BHM), that was ( a few weeks ago) the last one in MMC stock. So far the gauges are back working
When time allows I will try to use the wire colours and a dvm/scope, to help work out the inputs and outputs to the MEE 3600 and try to make a bench test of the old module.
Regards
Mike
