1990 festiva bogging down at acceleration and won't charge battery

15

Asked by Jul 20, 2016 at 06:29 PM about the 1990 Ford Fiesta

Question type: Maintenance & Repair

Just changed alternator and battery as felt both could be issue. Car runs well but once warm bogs and wont charge battery.  Turn key and won't even click (also changed alt belt at same time)

8 Answers

21,670

Check for a blown alternator fuse.

15

alternator fuse appears to be fine

21,670

So once vehicle cools off vehicle will start ?

21,670

or does it need to be jumped?

15

if the batt has enough juice, yup.. I've been carrying a backup batt to swap out when first one tanks lol. it's like the heat makes something expand and stop allowing alt to flow charge to batt

21,670

Do you have an extra fuse that you can replace the alternator fuse with just to rule out that the fuse is good ? You can also use a test light to make sure fuse is good.

15

not as of yet but I'll grab one and check that as well as all connections when I can crawl under it. thanks for the suggestions, hope to attack this this weekend.

575

Instead of using a test lamp rather us a Multi Meter. Is the alternator charging enough ? With the volt meter across the battery the charging voltage will be between 13.0 and 13.5 volts. The voltage drop on engine cranking should not go below 9.6 volts.

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