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Member Since 16 Feb 2010
Offline Last Active Aug 17 2014 09:55 AM

Topics I've Started

Long-Term Battery Problem.

14 January 2014 - 10:35 AM

I wonder if any auto-electricians out there have any ideas on this irritating problem I have had pretty well throughout the four-year life of my Fiesta ?

I have had a succession of battery failures, going either almost or completely flat, usually overnight for no obvious reason.  Each time they checked, the AA proved there was a good output from the alternator and there was no current drain.  The Ford dealer subsequently changed first the alternator and then the battery under warranty (although I am not convinced that the battery they fitted was a new one).

I eventually put the problem down to the frequent very short journeys I do and fitted an LED voltmeter plugged in to the power socket to monitor the battery voltage.

Usually, the voltmeter shows about 12.2 volts static and after start up and sometimes goes up to 14 v settling down to around 13.0 - 13.2 whilst driving.  I have taken to putting it on trickle charge every few weeks which I think should not be necessary.

The battery failed again only last week which was quite inconvenient.

What has prompted this particular post is that while out yesterday, I noticed that the voltage dropped to only 11 volts with no lights or heated screen on which quite concerned me.  To see how low it would drop with a load,   I switched on both heated screens, half expecting the engine to cut out  but to my surprise it actually rose to 13.2 and stayed there after I switched the screens off. 

When I got home I kept the engine running and double checked the reading across the battery with my Fluke testmeter and it showed a normal 13.2 - 13,5v, confirming the LED reading inside the car.

The car has only done 17,000 miles in four years.

Anyone have any ideas ?

2006 Mondeo 2L Diesel Gem Reset

01 September 2013 - 10:15 AM

After Halfords had changed the waterpump on my Mondeo, the 'engine management light' came on and despite being back twice, Halfords are unable to clear it.  They say there are actually no faults but the 'Generic Electronic Module' (GEM) needs to be reset which can only be done by a Ford garage.  Surely there must be other garages in the trade that can do this without paying franchise charges ?  I suspect also, that there may be a 'backdoor' way of doing this  without specialist equipment.  Does anyone out there now about this ?

Halfords gave me this list of fault codes which are currently present which clearly are false as there is no fault with the car:


B1335 Passenger door circuit

B1335 RR door ajar

B1571 LR door ajar

U2644 Unknown fault

U3552 Unknown fault

C3396 Unknown fault

P1198 Pump rotor control under fueling

C3500 Unknown

P0012 Intake camshaft position timing over retarded


How changing the water pump caused all these faults is quite an achievement !  They must have disturbed something in the process.


Can anyone help or do I have to go to Ford ?