unknown problem Aston Martin vantage

[Buzzi77]

My 2006 So Martin Vantage wouldn't start today. It was giving me a lot of warning lights, such as "key not recognized," "check electrical system," "variable," and what happened. I bought a new battery, but the situation didn't change. I tried checking the fuses and replaced some.


Then I connected another car with the cables and if mine is on I turned it over to recharge the new battery, maybe it was flat from the factory, but nothing happened, the problem continues, it doesn't turn on and it shows me all the possible error lights, then I tried to start it again with the cables the car started I removed the cables and tried to see if the car stayed running by removing the cables attached to the battery because I thought it could be the broken alternator, as I removed the cables from the positive and negative pole of the battery the car turned off what could it be.
From what I know the alternator problem occurs when if you disconnect the battery cables and the car is on and the car turns off it means that the alternator is not working and confirm this.


I also tried checking the large battery fuse, the blue one, but it looks fine, at least visually.

[LTP]

At first sight it sounds like a battery issue. But I need to ask some questions to make sure I understand:

• When you say you bought a new battery, did you fit it to replace your old one? But the situation didn’t change?
• You then put jump leads onto the car; where did you connect them? But you still had warning lights?
• With the jump leads attached you could start the car. Did all the warning lights go out while it was running?
• Then, with the car running, you took the jump leads off and the car stopped?

Unless your answers to my questions give additional information, my guess would be one of the following:

• The battery in your car is no good. But you said it was new (not different, brand new) so this doesn’t seem likely
• You have a poor connection between the battery and the car, so it can supply enough voltage to light the warning lights, but not enough to start the car or keep the engine running.
• You have a poor earth connection between the body and the engine. There are earth braids between the chassis and the torque tube at the rear and these can break or become corroded.

Ideally, you need a multimeter, so you're not guessing and can measure voltages. I’d try cleaning all of the battery connections at both ends, and get under the car to clean both ends of the earth braids. Do this first. Then, make sure you have a fully-charged battery before you try to start it agin.

But I could be wrong - diagnosing a problem from text is always tricky

[Buzzi77]

LTP said:

At first sight it sounds like a battery issue. But I need to ask some questions to make sure I understand:

• When you say you bought a new battery, did you fit it to replace your old one? But the situation didn t change?
• You then put jump leads onto the car; where did you connect them? But you still had warning lights?
• With the jump leads attached you could start the car. Did all the warning lights go out while it was running?
• Then, with the car running, you took the jump leads off and the car stopped?

Unless your answers to my questions give additional information, my guess would be one of the following:

• The battery in your car is no good. But you said it was new (not different, brand new) so this doesn t seem likely
• You have a poor connection between the battery and the car, so it can supply enough voltage to light the warning lights, but not enough to start the car or keep the engine running.
• You have a poor earth connection between the body and the engine. There are earth braids between the chassis and the torque tube at the rear and these can break or become corroded.

Ideally, you need a multimeter, so you're not guessing and can measure voltages. I d try cleaning all of the battery connections at both ends, and get under the car to clean both ends of the earth braids. Do this first. Then, make sure you have a fully-charged battery before you try to start it agin.

But I could be wrong - diagnosing a problem from text is always tricky

Thanks @lpt for all the information you're giving me. Unfortunately, I realized the alternator is broken. I used a voltmeter, and here's the result: Engine off.

12.6 V → battery perfect, so the new battery is fine. Then I measured with the engine running.

Less than 13 V (exactly 12.6) here, so → alternator not charging. That said, I'm looking for alternators at a decent price. Thanks, LPT, for your support.

[Buzzi77]

Ok. I just wanted to update the situation. In these two days I have made a real culture of the fuses and relays that are on my Vantage
I did a thousand tests.
In the end 99% is the alternator broken. My car starts if connected to the cables of my wife's Audi, when it is connected the voltage arrives and no error appears. As soon as the cut-off begins to show low battery and all possible warning lights. On the road, if I turn on the air conditioning, the car loses strokes. In a nutshell, it is the alternator.
I found some that were not Aston Martin.