Help! Urgent help with wiring diagrams needed!

[macaroni]

Guys,
my garage is having some problems with the wiring on my Murena.
I have given them the wiring diagrams supplied elsewhere on this forum, but they need a key to the symbols and numbers. I can't find them on espace-murena.com, can anyone point me at them.

They also need wiring diagrams for the alternator and fuse-box, specifically - any ideas?

This is really annoying me know as I haven't had my car for 2 weeks and the garage are no nearer getting it sorted.

Any help gratefully received.

Antony

[macaroni]

OK, I panicked and have now found the full set of diagrams on espace-murena.net.

I hope the garage can read french!!

[Anders Dinsen]

It's good that you found them. Note that there are some errors in that diagram and also that it doesn't specifically cover the 2.2. The Murena tech advisor in the MECUK has a better diagram that is surely worth the investment (I think it's 5 GBP for a laminated paper copy).

What kind of problems are you having?

It's really horrible to be without the car for so long.... you must be suffering bad!

[macaroni]

OK, I will give Roy a call.

Well, the alternator charge light was on above 2000rpm and they traced the problem to some bad wiring and now they are all confused by it.

Many of my friends are dying to see/have a go in the car and I keep putting them off. They must think I don't really have one!

[Anders Dinsen]

Charge light coming on above a certain RPM sounds more like a defective rectifier in the alternator. Anyway, if it's only wiring then it should be relatively easy to fix. It isn't that complicated - at least not compared to modern cars!

I really hope they get it sorted out soon. Don't hesitate to call Roy, he can probably help diagnose the problem.

Cheers,
- Anders

[krede]

My charge light, have a habit of turning on when under strain..... and since i plan to run an electric waterpump, and some other goodies in the future, I am looking for a replacement :-)

[macaroni]

Well I took the alternator to a specialist who tested it and said it was perfect, but some of the connectors had corroded, so I suspect that is where the problem lies.

I was it this morning and they were hard at work on it, so hopefully, it should come back today or tomorrow.

Krede, electric water pump? Whatever for?

[Matra_Hans]

Hi
I am also planning to install an electric water pump incl an electronic controller.
The electric water pump (EWP) has several advantages and that’s is why they are used on many track cars.
1 The car needs a lot of cooling when you are driving in slow traffic; the EWP and an electric fan deliver this.
2 At high engine r.p.m. you get more power from the engine if you have an EWP as the engine do nor have to pull the water pump.
3 You can set up the EWP controller to continue cooling the engine some minutes after you have stopped the engine (good for a turbo engine).

See this home page for further info:
http://www.daviescraig.com.au/main/display.asp?pid=26

The Murena alternator is a 55 Amp unit; you can change the alternator to an 80 Amp unit if you need more electric power. The 80 alternator is available from Simon at the same price as the 55 Amp unit. I have my self installed an 80 Amp unit years back.

regards Hans

[Anders Dinsen]

I have a few electrical problems too which I'm going to track down but seems to be related to the power passing through the ignition key back to the fuse board and then back again to the dash board. One effect of it is that the dash voltmeter is in the red area most of the time - but the battery is fine when I measure it, so it's not a real problem.

The are several known sources of problems one being the edge connectors on the fuse board which only make contact on one side of the board and therefore tend to go bad.

Another is bad earth connections in the car.

I'm not worried about my problems as there is plenty of power to the ignition, battery charges well, headlamps work fine etc, so I haven't really had time to do anything about it yet.

Worse for me is that water enters the trunk through one or more rivets - this means that the inside of the rear window is constantly misty while the engine heats up. The ventilation from the trunk seems to less than optimal in such a case.

It will be interesting to hear about your experiences with electric water pumps!

[Lennart Sorth]

voltmeter is in the red area most of the time - but the battery is fine

heh - YOU don't have a problem Anders, - every single Murena I have ever seen, has had this "error" to some extent. 

The reading drops even further if you use some power for the fan, radio,wipers or even the radiator-fan. The reason being that the admittedly poor connection causes the voltage to drop as the amount of current passing increases.

I have previously found the voltage-drop very useful to indicate that the radiator-fan in fact has cut in. These days my overrideswitch with builtin LED does that job for me though.

Has anyone btw tried to connect the dash-voltmeter directily to the battery, to find out WHERE it actually shows 12V ?   - (when the engine is running and the alternator doing its job, there should actually be 14.4V across the battery.)

/Lennart

[Anders Dinsen]

voltmeter is in the red area most of the time - but the battery is fine

heh - YOU don't have a problem Anders, - every single Murena I have ever seen, has had this "error" to some extent.

Ok, yes, I have heard about it before (!) - anyway, since I want it to be correct I *do* have a problem ;-)

Has anyone btw tried to connect the dash-voltmeter directily to the battery, to find out WHERE it actually shows 12V ?   - (when the engine is running and the alternator doing its job, there should actually be 14.4V across the battery.)

That is a very good idea for a permanent modification actually...

[Lennart Sorth]

That is a very good idea for a permanent modification actually...

not really IMO, as the problem will still be there, you just cannot see it anylonger.

But it would be very good to know just WHERE the voltmeter actually reads 12V

Maybe some of the "crusty old dinosaur" Murena-owners, who've had the car from new, can enligthen us on where the voltmeter pointed when the car was new ??

/Lennart

[roy4matra]

Maybe some of the "crusty old dinosaur" Murena-owners, who've had the car from new, can enligthen us on where the voltmeter pointed when the car was new ??

Lennart

My battery indicator sat in the middle when it was new, which was indicating 13.4 volts which was the output at that time.  A charging system can be anywhere between 13.4 and 14.4 volts when it is correct and depends upon the state of the battery.  Anywhere outside this range is incorrect and means the voltage regulator is outside tolerance.

After some years and the degradation in the various contacts the needle would only indicate just above the red on the left, and I found that the gauge was reading almost 2 volts lower than the figure at the battery terminals.

So I cleaned up all the contacts in the system, particularly at the fuse board edge connectors and the gauge came back to reading in the centre.

Roy (crusty old dinosaur!)

[roy4matra]

my garage is having some problems with the wiring on my Murena.
I have given them the wiring diagrams supplied elsewhere on this forum, but they need a key to the symbols and numbers.

They're not very bright then! :-)  The diagrams are self explanatory with most items drawn to look like the units they represent, and the numbering system is easy to follow, particularly for a good auto-electrician.

They also need wiring diagrams for the alternator and fuse-box, specifically - any ideas?

Yes, why did you not contact me Antony?  You know as a club member, that I have accurate diagrams that are advertised in the club magazine.  If I have taken the trouble to correct all the faults, and make my own diagrams, it surely tells you I can answer any questions on the Murena wiring.

This is really annoying me know as I haven't had my car for 2 weeks and the garage are no nearer getting it sorted....

Why wait two weeks and why ask here before coming to me?  This could have been sorted in two days!


Since I have been laid up for nearly two weeks with a bad leg, and I cannot work, I have had some time to read through many more of the topics and questions on this forum.  That is why you will find quite a few answers from me recently!  I normally would not have the time to read the vast numbers appearing here.  However, I am always open to direct email questions.

One thing that strikes me from reading many of the questions here, is that maybe I need to remind people to read my FAQ pages, and if the answer you need is not there, please email me to see if I can help.  It might just bring to my attention another question that needs adding to my FAQ's.  Thanks.

Roy