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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22736
Experience:  BEng hons Mech engineering, in auto industry 22 years
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hi the battery of my aston db9 vanquish has just gone down

Customer Question

hi the battery of my aston db9 vanquish has just gone down
i have managed to jump start it and get the car running
it has now locked into Limp home mode and will not go into gear
the battery light is glowing red in the speedo dial
help as i need to move the car
many thanks
Submitted: 4 years ago.
Category: Car
Expert:  Matt replied 4 years ago.

the cars's systems are very sensitive to battery voltage so if your current battery has died and no longer holds a charge then it will need replacing

However it could be it just needs charging so try that 1st and also check that the alternator is actually charging the battery in the car by taking a battery voltage reading with the engine off then another with the engine running. The 2nd reading should be higher than the 1st and climbing steadily. And also check that the alternator is secure to the engine as this provides the ground for the charging circuit and make sure that the engine / gearbox earth strap is secure and the contacts are clean and bright.


if the alternator appears not to be working - take it to a electrical specialist and ask them to test it as sometimes you can replace just the diode pack and this will repair the alternator without requiring replacement
Customer: replied 4 years ago.

hi there thanks will replace battery and let you know if it works


Expert:  Matt replied 4 years ago.
No problem Tony

just get back to me on this post