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| madmax |
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Although its a 4 cylinder I thought this might be the best place to get an answer for this.
My wifes Lancer keeps boiling the battery over. Serious acid leading to inner guard corrosion. I'm thinking its being over charged. I put a meter on it and got 14.35volts is this enough to do this or is it something else?
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| The Dog |
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14.35 V sounds pretty high but I would not have thought this could boil the battery
 Anything over 15 could do it though. Was the 14.35 V at idle or at around 1800 revs?
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| blackjack_original |
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Posts: 3516 Joined: 8th Nov 2004 |
[self-deleted]
Last edited by blackjack_original on Fri Jun 06, 2014 10:06 pm, edited 1 time in total. |
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| madmax |
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xhute0 wrote: 14.35 V sounds pretty high but I would not have thought this could boil the battery Anything over 15 could do it though. Was the 14.35 V at idle or at around 1800 revs?It was at Idle blackjack_original wrote: I don't think high voltage has much to do with it being overcharged. 14.35 is not what i would call high either. The problem is more likely that it never stops charging. My bet is, that your regulator is stuffed.
Yeah thats what I leaning towards, a crook reg.
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| The Dog |
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Alternators put out peak power above 1500 revs but I agree with blackjack more than likely it is the reg. Easy change on later alternators but just as easy to slip a reco alternator on em too.
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| fordzatmyplace |
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blackjack_original wrote: I don't think high voltage has much to do with it being overcharged. 14.35 is not what i would call high either. The problem is more likely that it never stops charging. My bet is, that your regulator is stuffed.
high voltage is HOW batterys over charge, you will damage the battery if an alternater is charging at like 16 volts. lol 14.35 is acceptable... Must be a strong f**k alternater. Did you get that reading at idle and with no accesorys on? Try cranking the revs up to 3000 rpm with the meter over the terminals. If the volatge keeps going up with the engine speed then the reg is f**k
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| old_mate |
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how old is the battery? it could just have too much electrolyte in it, check the reg as others have said
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| madmax |
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old_mate wrote: how old is the battery? it could just have too much electrolyte in it, check the reg as others have said
Battery is about 18 months old.
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| madmax |
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fordzatmyplace wrote: blackjack_original wrote: I don't think high voltage has much to do with it being overcharged. 14.35 is not what i would call high either. The problem is more likely that it never stops charging. My bet is, that your regulator is stuffed. high voltage is HOW batterys over charge, you will damage the battery if an alternater is charging at like 16 volts. lol 14.35 is acceptable... Must be a strong f**k alternater. Did you get that reading at idle and with no accesorys on? Try cranking the revs up to 3000 rpm with the meter over the terminals. If the volatge keeps going up with the engine speed then the reg is f**k Ok just tested it at revs, no tacho, so just got the wife to gradually bring revs up. Voltage only climbed to 14.45
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| msman |
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how much is the thing used.
no other issues associated with dead batteries we've encountered on the cabs we have had so far, they have enough juice to crank the engine over etc just start to spit acid out.
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| madmax |
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Enough to seriously corrode the battery shelf, inner guard and battery clamp.
Often leaves rusty puddles on floor. This is not coolant.
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| smiley235 |
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Maybe the battery is just a lemon.
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| The Dog |
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I would still be sus on the alternator despite the output readings. Really sounds like it is overcharging.
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| old_mate |
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New battery i'd think. Or pull some electrolyte out of it (but its 18 months old) The voltage doesnt look high enough to be causing an overcharge
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| snap0964 |
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Well I suppose it's either the battery or the alternator/reg as we know.
I'd be slanting towards the battery - my theory's a bit hazy, but I wonder if a plate or two have buckled and are shorting with others, reducing the battery capacity, i.e. it may be accepting a max of 10v for example, the diff between 14v and 10v is greater, causing the battery to get hot. You could try putting it on a battery charger for a few hours, and see if it gets hot and may start to boil electrolyte, if its does at least it rules out the alternator. Perhaps run your BA battery in the lancer (if it will fit) and see if the same problem arises. Just touch test it often, obviously for it to spew electrolyte, it will get pretty hot. Voltage doesn't always show the whole picture - older cars used to run ammeters, certainly would be handy in this situation, would show what the alternator/reg is doing.
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