Jump to content


Photo

2002 Tddi Dimming Lights - Alternator Or Battery?


  • Please log in to reply
2 replies to this topic

#1 PSABIN8951

PSABIN8951

    Member

  • New Member
  • PipPip
  • 10 posts
  • Name: PAUL
  • Ford Model: FOCUS 1.8 TDDI
  • Year: 2002
  • Location: Devon

Posted 07 December 2012 - 09:40 AM

My 2002 Focus estate TDDI has just started showing the following symptoms:- when idling with dipped headlights on, if I switch on either of the heated window elements the headlights dim. Is this due to the regulator in the alternator on its way out or the battery starting to die?
Also on the subject of batteries what amperage should the battery be?

Have something to contribute?

Sign in or register to start a topic...



Sign up to FOC Premium Membership To Remove These Ads

#2 stef123

stef123

    Ford Enthusiast

  • Management
  • 5,806 posts
  • Name: Stefan
  • Ford Model: Mondeo ST TDCI
  • Year: 2006
  • Location: Scotland
Contributor

Posted 07 December 2012 - 10:15 AM

Switching on a high load such as a heated screen will cause the lights to dim slightly.

#3 mjt

mjt

    Too much time on the boards

  • True Ford Enthusiast
  • PipPipPipPip
  • 501 posts
  • Name: Mike
  • Ford Model: Focus Mk2.5 Zetec 1.8HE
  • Year: 2010
  • Location: Cambridgeshire

Posted 07 December 2012 - 10:24 AM

I find that if I switch on the front heated screen the wipers will slow down noticeably even at normal road speeds. The front screen, particularly, takes a very high current which is one reason it's on a fairly short time-out. The high current causes a significant voltage drop, partly because the alternator current will be internally limited and partly due to losses in the wiring.


Not what you're looking for?

Register now, we have a huge community of enthusiasts to answer any questions you might have



0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users