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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22247
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Car is a 2005 1.4 vw polo 5 door auto. battery was charged

Customer Question

car is a 2005 1.4 vw polo 5 door auto. battery was charged overnight. when driving engine is fine for a few minutes then will lose power. could it be alternator?
Submitted: 1 year ago.
Category: Car
Expert:  Matt replied 1 year ago.

Hello

if the battery voltage is low then yes you will have engine running issues

So 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

And one last thing is – how old is the battery? – As even good quality ones need replacing every 5 years and faulty battery just won’t hold a charge

Expert:  Matt replied 1 year ago.

Hi

do you still need help?

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