Alfa Romeo Forum banner
1 - 20 of 27 Posts

·
Registered
Joined
·
3 Posts
Discussion Starter · #1 ·
My Giulia Veloce has a 5 amp drain somewhere. Any suggestions as to what it could be before I call in the pros?
 

·
Registered
Joined
·
3 Posts
Discussion Starter · #3 ·
Hi, it's a late 2018 model. That might make sense as I used the radio briefly the other day. I turned everything off in the car before locking it then the following day, when I unlocked the car, the radio came on by itself before I had even opened the door.
 

·
Registered
Giuilietta veloce 1.4 multiair & Merc C180 coupe
Joined
·
152 Posts
Just came across your post and whereas I have no Giuilia experience. If you have a multimeter with amps scale you can easily find the current drain. Connect the ammeter in series between the battery terminal and the battery and check the current drain. If you have a reading above 1.5 to 2 amps locate the fuse box and pull fuses out one by one to see which circuit is causing the drain. Just remember where the fuse came from. 😀
 

·
Registered
Joined
·
1,767 Posts
By just removing the battery terminal, the drain could stop until the ignition is switched on. But if you do that, your multimeter will smoke.
 

·
Registered
Giuilietta veloce 1.4 multiair & Merc C180 coupe
Joined
·
152 Posts
You are looking for a drain that occurs without ignition supply. So simply connecting an ammeter in series between the terminal and battery will not have any negative effect on the meter. Typically you are looking at isolating components hat don’t require ignition supply so that rules out a lot of fuses. However components that have a timer may require ignition supply to operate normally but can still have a permanent feed. If the problem is in the timer/ relay a component that needs ignition feed can still drain when not switched on. For example you may have a HRW timer causing the drain although it needs an ignition feed but because the timer/relay may have shorted it can still put the HRW on and drain the battery.
 

·
Registered
Joined
·
12 Posts
First, how did you diagnose that you have a 5 amp drain?

Second, if you set your multimeter to amps and connect it in series (I recommend doing this on the battery negative post as it is easiest to detach), you won’t “smoke” anything. The meter has a fuse when measuring amps, that will blow before the meter is damaged. However, if you have an amp clamp you can put around the battery you won’t need to disconnect anything.

I also recommend that rather than investing time in pulling fuses, you measure the voltage across them. It is way quicker. Here is a video explaining how this works…


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
3 Posts
Discussion Starter · #8 ·
Just came across your post and whereas I have no Giuilia experience. If you have a multimeter with amps scale you can easily find the current drain. Connect the ammeter in series between the battery terminal and the battery and check the current drain. If you have a reading above 1.5 to 2 amps locate the fuse box and pull fuses out one by one to see which circuit is causing the drain. Just remember where the fuse came from. 😀
First, how did you diagnose that you have a 5 amp drain?

Second, if you set your multimeter to amps and connect it in series (I recommend doing this on the battery negative post as it is easiest to detach), you won’t “smoke” anything. The meter has a very high resistance when measuring amps, you won’t be flowing any actual current through the meter. However, if you have an amp clamp you can put around the battery you won’t need to disconnect anything.

I also recommend that rather than investing time in pulling fuses, you measure the voltage across them. It is way quicker. Here is a video explaining how this works…


Sent from my iPhone using Tapatalk
Thanks for taking the time to reply everyone. It was diagnosed by the AA when I called them out a couple weeks ago. I lack the equipment that you have suggested but at least I can point the pros in the right direction and maybe save a bit of labour time. The car's under warranty and is going to a trusted independent Alfa specialist on Tuesday. Fingers crossed for a quick fix!
Thanks again.
 

·
Registered
Alfa 159 2.0 JTDm Lusso 6sp.
Joined
·
8,315 Posts
Don't think it will be the radio....5 amps at 12v is 60 watts......the radio display could not pull that much!.....I doubt the amp is even 60watts. That's a lot of power being used by something.
 

·
Registered
Giuilietta veloce 1.4 multiair & Merc C180 coupe
Joined
·
152 Posts
Don't think it will be the radio....5 amps at 12v is 60 watts......the radio display could not pull that much!.....I doubt the amp is even 60watts. That's a lot of power being used by something.
Doesn’t that depend on the resistance of the circuit? Haven’t done ohms law since college 😀
 

·
Registered
Giuilietta veloce 1.4 multiair & Merc C180 coupe
Joined
·
152 Posts
Don't think it will be the radio....5 amps at 12v is 60 watts......the radio display could not pull that much!.....I doubt the amp is even 60watts. That's a lot of power being used by something.
Ignore me I forgot about watts law.
 

·
Registered
Joined
·
4,506 Posts
First, how did you diagnose that you have a 5 amp drain?

Second, if you set your multimeter to amps and connect it in series (I recommend doing this on the battery negative post as it is easiest to detach), you won’t “smoke” anything. The meter has a very high resistance when measuring amps, you won’t be flowing any actual current through the meter. However, if you have an amp clamp you can put around the battery you won’t need to disconnect anything.

I also recommend that rather than investing time in pulling fuses, you measure the voltage across them. It is way quicker. Here is a video explaining how this works…


Sent from my iPhone using Tapatalk
If you turn ignition on with meter in series it will pull more than 10 amps powering up all the cars systems especially on a diesel with glow plugs. Which is what jetronic is saying,however most meters are fused at 10amp to stop it going up in smoke
 

·
Registered
Giuilietta veloce 1.4 multiair & Merc C180 coupe
Joined
·
152 Posts
If you turn ignition on with meter in series it will pull more than 10 amps powering up all the cars systems especially on a diesel with glow plugs. Which is what jetronic is saying,however most meters are fused at 10amp to stop it going up in smoke
There are 20 amp multimeters out there are you saying they are fused at 10 amp?
 

·
Registered
Joined
·
12 Posts
If you turn ignition on with meter in series it will pull more than 10 amps powering up all the cars systems especially on a diesel with glow plugs. Which is what jetronic is saying,however most meters are fused at 10amp to stop it going up in smoke
I was asking the OP since there weren’t a lot of details. Before looking for a 5 amp draw, I wanted to confirm that he was testing properly.

While you are correct that more than 10 amps will pop the fuse in most meters, I can’t imagine why you would turn the ignition on and power up every system while looking for a parasitic draw. By definition a parasitic draw is one which continues to draw more than specified power when every module has supposedly gone to sleep.

I have chased parasitic draws in over a dozen cars through the years and have never damaged my meter.


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
4,506 Posts
I was asking the OP since there weren’t a lot of details. Before looking for a 5 amp draw, I wanted to confirm that he was testing properly.

While you are correct that more than 10 amps will pop the fuse in most meters, I can’t imagine why you would turn the ignition on and power up every system while looking for a parasitic draw. By definition a parasitic draw is one which continues to draw more than specified power when every module has supposedly gone to sleep.

I have chased parasitic draws in over a dozen cars through the years and have never damaged my meter or my scope.


Sent from my iPhone using Tapatalk
I agree i was chasing a parasitic drain on a disco a few weeks back so know how it’s done, I was merely responding to a comment further up referring to turning ignition on and making a meter smoke.
 

·
Registered
Joined
·
325 Posts
Yes the ignition should not be activated when you set about finding the battery drain but care is needed that you don’t accidentally activate something that draws enough amps to blow the DVM. For example the Mito has the windows drop each time the doors are opened so you would wind the window down before you hook up the DVM. In my Mito the Bluetooth unit had died and was still pulling a current and I sourced the problem by pulling fuses one at a time…
 
1 - 20 of 27 Posts
Top