Hi folks hopefully somebody out there can help me out
I have a 2.0 tdci ford mondeo in for a repair the alternator light stays on all the time i had suspected that the diode pack had failed as the battery was charging ok 14.2 volts at idle and drops to 13.5 volt every thing on so sent it out to be checked at my auto sparks he ran it up did some tests said all was ok i have checked wiring and all seems ok have even put a new alternator on to test still the same
The only thing i have noticed is that the heated front screen is not working on theis car wondering if there maybe a fault in this which may be cauzing this fault

any help will be gratefully recieved

 

Check F30 in the fuse box.

Is the aux belt and tensioner in good order? If they're old and the belt slips it can obviously make the light come on.

The heated screen won't operate if the voltage is too low, or could be causing the issue.

 

It will have a "Smart charge" system, don't know on these but from what your describing it may be what has been known to happen on other Ford models, on the unit you will see a three pin plug, sometimes the wiring for this can come loose and cause problems.

It is charging conventionally but not via "Smart charge"

Martin

 

cheers for the Imfo Dan I will Have a look at this when the car comes back in

 

Thank Martin i will look into this as well

 

Hello I have managed to get to the bottom of this fault it seams the wires that plug into the back of alternator the multi plug dad a adaptor wire fitted which reversed the two wire i removed this and reattached original loom and all is ok