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Discussion Starter #1
Hi there, has anyone else found that their 147 appears to get about 18 months out of a new battery before it needs replacing? Mine has had 2 batteries in nearly 3 years. Car runs well with no known faults although it does do low mileage and during the cold weather of course it gets a bit of a caning with the heater/air con, heated rear window, lights etc all on at once. Someone has said that some aspect of the climate control/heater drains the battery when the car is standing but don't know if this is true. Of course the alarm etc is on when parked so that is another possibility. Any ideas would be appreciated. :confused:
 

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battery going flat

my 156 had a flat battery and the problem was found to be a drain

it was chased to the voltage regulator to the heater fan

the part cost me £ 103
 

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I now do 12 miles return trip to work now instead of 40 a day and in the last month of cold starts with all the electrics on has had an effect that a motor system failure light has come on . Popping to alfa to get it put out and see what they say
 

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I now do 12 miles return trip to work now instead of 40 a day and in the last month of cold starts with all the electrics on has had an effect that a motor system failure light has come on . Popping to alfa to get it put out and see what they say
12 miles is morethan enough to keep battery topped up ..you may have another issue
 

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Discussion Starter #7
my 156 had a flat battery and the problem was found to be a drain

it was chased to the voltage regulator to the heater fan

the part cost me £ 103
Someone did tell me that they thought the heater had something to do with it so maybe that's it... don't fancy spending £103 though, but then that's not a lot more than a battery anyway.;)
 
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You really need to check for a parasitic current draw to be sure.
Two of the more obvious potential problems though
1) is the boot light remaining on ?
2) does it have an aftermarket stereo fitted, if so does it only come on with the ignition ?
There have been reports of problems with the standard head unit going faulty too and causing problems if a cd is not left in, although that may only be the GT
 

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Discussion Starter #10
I've had my car checked by an independant Alfa specialist and have been advised that the car is fine and that it's charging the battery properly but the battery itself is not "man" enough and is probably a bit cheap and cheerful. It still starts but is slow to turn over in this very cold weather so I think a new battery is on the cards in the future....
Thanks for all the responses to this thread...
 

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Maybe it is a problem with voltage regulator on the alternator ? I have same problem in my t-Spark, still try solve the problem.
 

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If you have an ammeter, set it to approx 1A range initially and connect it in series with the +'ve battery terminal with everything turned off, doors closed & locked etc. If you have a drain it will show up as a value.

ie ---loom---[+ bat connector]--------(ammeter)--------[+ve battery post]

There is bound to be some baseline drain by the alarm/immobiliser unless you can disable it, but that should be a low value. I don't know what on AR's but 50mA (0.05A) or less is pretty typical for most vehicle systems. If it's considerably higher something ain't right.

Then it's a matter of repeating the above whilst pulling one fuse at a time from the fuse panel until the extra drain no longer occurs. This will localise the circuit that is causing the drain.

Thereafter it's a matter of trying to find which component in that circuit is drawing current when it shouldn't be, using the meter as a resistance meter to try and spot measureable resistances between permanent (not switched) live feed side of the component and earth where there should be open circuit.
 

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na the back lights not staying on ect and the cd player goes off when you turn the car off (after a few mins anyway!) and boot light goes off, it takes a couple of days to run flat and the batt is new and top of the range!
 

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If you have an ammeter, set it to approx 1A range initially and connect it in series with the +'ve battery terminal with everything turned off, doors closed & locked etc. If you have a drain it will show up as a value.

ie ---loom---[+ bat connector]--------(ammeter)--------[+ve battery post]

There is bound to be some baseline drain by the alarm/immobiliser unless you can disable it, but that should be a low value. I don't know what on AR's but 50mA (0.05A) or less is pretty typical for most vehicle systems. If it's considerably higher something ain't right.
Mine has a drain of 0.03 with car unlocked/alarmed,but arm/lock it an its 0.17?? (04 gt jtd) drains over a few days if not used.
 

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Mine has a drain of 0.03 with car unlocked/alarmed,but arm/lock it an its 0.17?? (04 gt jtd) drains over a few days if not used.
Mine was down to the after market radio not turning off with the ignition, though it was off on the off button it was still draining the battery!
 
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