Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Dash Switches - PCB Protection 2003-2007 Morgans

I am now the proud owner of a 2007 Morgan +4 4 seater.. thankfully it has fully working dash switches.




However thinking ahead what can one do to protect the PCB?

What triggers the PCB Failure aside from water ingress?

Can you replace the Unit with traditional switches and relays like you can on the post 2007 cars?

Many thanks
Will

Somebody has already changed the 4 switches, I remember the dash from my previous Roadster, cream gauges and sensible layout with speedo and tacho ahead of the drivers view...lovely

ps, a set of 10 'Wolf' bezels for the warning lights just finishes it off (IMHO)

The switches are the same it just the covers, very quick to do

https://www.lemans62.org.uk/uploads/2/5/6/8/25680891/changing_switches_an_alternative_method.pdf

Yes, apologies I meant the lollypop inserts

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

On mine I had the lights wired permanently on. I did this because I was told there are 2 micro power supplies one with lights one without.

It worked for me till a white van t boned the S1 Roadster

Double check the windscreen washer tubing behind the dash. If its the black rubber perishable type as fitted originally, replace it NOW with neoprene tubing (that is durable and long lasting).. To do this there are three screws to remove to lower the dash, but you will first have to lower the steering column to its lowest setting and of course the plastic moulding behind the steering wheel. Why MMC chose to use cheap rubber tubing in the first place heaven only knows !!! - It leaks sooner rather than later and can cost you an arm and a leg when water leaks down onto the circuit board.

Once I had the MMC licquorice tubing sorted out in 2009 with aquarium fittings and tubing I fitted a polytunnel grade cover over the whole of the critical area as they all leak in that area at some stage if you use the car year round, as I do. So I shall be fitting one to our Sons 4/4 Sport before the rainy season.

No such worries of course with the trusty Plus 8, she just carries on in her analogue way like a Shire Horse.

She shed her throttle cable Tuesday night on the way home but with so much torque available made it home having "jury rigged" the throttle at 900 rpm with a tywrap easily from Dartmouth to home - try that on the newer generation CXes..


Looking forward to getting my 48" chest and 17.75 Stones into the footwell to replace the cable on our return from our holiday in Eire

It's a good job my good lady is a yoga expert and could easily slip inside a Coke bottle at around 8.5 Stone wet and a 10/12 as it'll save me taking the seat out.



BHM had a couple in stock and it will probably arrive today, they are good Sarah and the team.

I forgot I also replaced the t piece of the tubing with a brass unit. My plastic one had split.

If it hasn't been done already, clean and flush all the windscreen washer system and plastic piping out,, as the washer water tends to sit and collect over time and coagulate in the washer container. As the washers are rarely used and the gloppy mess then gets pushed thru and puts the system under greater pressure when you come to use the washers and can force the plastic pipe and t piece apart behind the dashboard and all the deliicate wiring and PCB,

I know as it happened to me..Use some form of ties on the plastic and t piece ends.