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possible catch fire

on and off

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9 replies to this topic

#1 jonyboyjonweechocbanana



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Posted 22 December 2013 - 12:44 PM

Strange one this morning whilst driving along the m8 the stereo and convers clock went off? Just for a few seconds. Then every thing returned to normal. But five poss ten mins heater clocks every thing its like a loud buzzing noise then every thing switches of? Now iv lossed convers altogether cars running fine. So what the heck. Checked battery lead and other conectors. Any one came across this before
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#2 peter scott

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Posted 22 December 2013 - 01:04 PM

What's a "convers clock"?



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#3 Squirt


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Posted 22 December 2013 - 01:12 PM

I'm guessing he means a MK4 Mondeo converse instrument cluster?
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#4 fordboi


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Posted 22 December 2013 - 03:41 PM

Battery/alternator causing a power dip/spike?

#5 jonyboyjonweechocbanana



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Posted 22 December 2013 - 05:57 PM

Alternator over charging? That's what t came up as when checked but it turns out it was the battery as well. Battery boiling its self. Never in a long time came across this. So some were in theses mondeo there must be a protecton unit to stop frying the electrics.? Well new alternater and battery and now all is well suprised it did not distroy smart charge
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#6 Mondeo-hopeful



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Posted 23 December 2013 - 07:51 PM

So no real danger of catching fire then? Enough scaremongering on here as it is without these types of titles.

Sounds like the regulator died causing over voltages.

Consider asking a mod to revise the title to something more suitable?
BLUETOOTH MODULE INFO www.talkford.com/topic/147387-please-help-for-btvc/page__p__1403226#entry1403226
Check your CONVERS+ version www.talkford.com/topic/154824-convers-versions/
Check your SPECIFICATION on ETIS here http://www.etis.ford...5707F2.fcvas509
To search the forum more effectively go to google.co.uk add the following to the search box :site talkford mondeo mk4 <your query> e.g :site talkford mondeo mk4 bluetooth

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#7 jonyboyjonweechocbanana



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Posted 23 December 2013 - 09:54 PM

Carm down dear its getting close to christmas? Problem solved and no fire no wiring burnt out and no problems to engine compartment but a total knackerd battery alternator fryed. Any yes it could have caused a fire so correct post corect title
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#8 siruncle


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Posted 26 December 2013 - 03:09 PM


it's obviously not so smart charge if it boiled your battery and baked your alternator. 

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#9 jonyboyjonweechocbanana



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Posted 26 December 2013 - 03:55 PM

Yes your right not so smart if it caught fire. Mind you new car lol ok that's not responsible. But sounds good. Since this The bloody radio keeps changing channels? And the inside lights have stopped working. I know there's fuseable links in the wireing loom so tommorow going two check all the fuses if its not them well engine wiring loom required and now back two my beer and jd honey yum yum
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#10 Spare Wheel

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Posted 01 January 2014 - 12:56 AM

 Battery boiling its self. Never in a long time came across this. So some were in theses mondeo there must be a protecton unit to stop frying the electrics.? Well new alternater and battery and now all is well suprised it did not distroy smart charge


Well, you can boil the battery if one of the cells shorts out - now, this isn't entirely unlikely at the end of life of a battery, so it is a bit surprising that 'battery boiling' isn't a bit more common.


what happens is

  • a battery cell shorts out and instead of 6 nominally 2 volt cells (nom 12 volt, 14.something on charge), you have five cells (nom 10 volts ~12 volts on charge)
  • on full charge, you have 12 volts across the battery, and the alternator just sees this as a slightly flat battery, which needs full current to get back up to voltage
  • full current, maintained for a long time produces heat (rather than translating into chemical energy)
  • battery boils
  • even 'fully sealed' batteries aren't; to avoid an explosion hazard, at a high overpressure, the protection valve will blow out and gas will be emitted

Note that a boiling battery emits sulphur dioxide, which is noxious, but without a distinctive smell, so that's not nice (you would notice a choking sensation, without an obvious cause in an enclosed space, although, as you are likely to be outdoors, the gas might disperse and this might not be noticeable) . It can also be rehydrated to form an acid, so that's not nice for for you car, either, possibly accelerating corrosion.


If you do this in an enclosed space, such as a garage, it is worse, of course.


All of this is within normal operating conditions for an alternator - the high current/low voltage aren't normally maintained for that long a time, but the instantaneous voltage/current are well within the limits for recharging a slightly down battery, so it is difficult to just say 'limit the current out of the alternator' because that will also limit the alternator's ability to recharge the battery, or cope with high loads.

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