• Join Premium & Save
      Join Premium & Save
    • Huge Range of Ford Parts
      Huge Range of Ford Parts
    • Get Your Club gear
      Get Your Club gear
    • Share Your Car Experience
      Share Your Car Experience
    • Savings Up to 15% Off For Members
      Savings Up to 15% Off For Members
    • 1000's Of Fords For Sale
      1000's Of Fords For Sale


wilcoxandy

Headlights Brighten On Acceleration

8 posts in this topic

Hi I have a 2009 1.8 tdci C Max which has a problem with the headlights, they brighten on acceleration as if the battery is low on charge, I changed the battery about 6 months ago and . This seems to happen only first thing in the morning for up to 10 minutes of driving. At times it is so noticeable that I get people flashing me as if to tell me I have my full beams on. Any one got any ideas?

Share this post


Link to post
Share on other sites
 

I reckon the battery is failing. That 10 minutes after startup is the time the alternator needs to top up the charge.

Put a multimeter on the battery when the car's been stood overnight, it should be around 12.6V, going up to around 14.4V with the engine running.

[edit] Just checked and as I thought, like most other Fords, yours needs a Calcium Silver battery, not a regular Lead-Acid. So check that you've got the correct type (it will say "Calcium Silver" or at least "Ca" on it).

mixmasterlooney likes this

Share this post


Link to post
Share on other sites

Another sign of the battery dying is testing your headlights. Switch them on before turning on the engines, whilst starting the engine they should dim slightly but not completely go out, if it does your battery is knackered no doubt

Share this post


Link to post
Share on other sites

Thanks I will check the battery, did not know it needed a calcium silver battery so will check that as well.

Share this post


Link to post
Share on other sites

Right I have checked the battery charge before starting and it's 12.5 volts; After I have started the car the voltage drops slightly (12.3v) but does not show a charge from the alternator until I rev the engine to 2500/3000 revs (it's then 14+ volts) .

I checked the connecters on the alternator for signs of corrosion (ok) and noticed that the alternator was very hot, virtually too hot to touch whilst the rest of the engine wasn't even warm (I had only run the engine for 5 minutes or so).

So it looks like the alternator is on it's way out!

Share this post


Link to post
Share on other sites

sounds like it!

I would say pick one up from a scrappy dirt cheap!

Share this post


Link to post
Share on other sites

Brand new is round 60 from euro car parts

Sent from my GT-I9300 using Ford OC mobile app

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now