dezwez Posted December 1, 2009 Share Posted December 1, 2009 hi the head lights on my focus have started to dim .Gos bright when i rev it then drops back also happens when i swicth some things on (ie) rear heat screen also rocks a bit when i pull up any help thanks :( Quote Link to comment Share on other sites More sharing options...
RS2000 Posted December 2, 2009 Share Posted December 2, 2009 hi the head lights on my focus have started to dim .Gos bright when i rev it then drops backalso happens when i swicth some things on (ie) rear heat screen also rocks a bit when i pull up any help thanks :( Probably need a new battery, have it checked out. Quote Link to comment Share on other sites More sharing options...
InstructorPiggy Posted December 2, 2009 Share Posted December 2, 2009 check alternator for charge rate :) Quote Link to comment Share on other sites More sharing options...
SierraYankee99 Posted December 2, 2009 Share Posted December 2, 2009 I'd do both these things. Mine did some really weird things (wipers on intermittent going slower when rear window heater was on etc). Now, with a new battery things are good. Quote Link to comment Share on other sites More sharing options...
InstructorPiggy Posted December 2, 2009 Share Posted December 2, 2009 had to fit two smaller batterys to my Colt when i had such a huge stereo system...would affect the whole car electrics when there was a bass beat! LOL! Quote Link to comment Share on other sites More sharing options...
SierraYankee99 Posted December 2, 2009 Share Posted December 2, 2009 I replaced the battery just before fitting the install cos I knew the old one (8 years old) couldnt take the strain. Quote Link to comment Share on other sites More sharing options...
InstructorPiggy Posted December 2, 2009 Share Posted December 2, 2009 mmm, yeah. had to go with two, worked better with the amp o the alternator 5yrs is normaly life of a topup battery, so you did well! Quote Link to comment Share on other sites More sharing options...
artscot79 Posted December 3, 2009 Share Posted December 3, 2009 i have thsae charge rate is fine and the battery is brand new so ide rule them out ive been told the focus alternator has a low rate and this is the problem the electrids cant take the strain the more you switch on the harder it is to cope if you had a tester you will find that the output fropm the alternator is still fine it only struggles when you have fogs on and rear screen heater fan stereo but as youre driving you have the accelerator on and the alternator is running fine when you stop it will drop to low output a little bit of revs picks it up Quote Link to comment Share on other sites More sharing options...
dezwez Posted December 3, 2009 Author Share Posted December 3, 2009 i have thsae charge rate is fine and the battery is brand new so ide rule them out ive been told the focus alternator has a low rate and this is the problem the electrids cant take the strain the more you switch on the harder it is to cope if you had a tester you will find that the output fropm the alternator is still fine it only struggles when you have fogs on and rear screen heater fan stereo but as youre driving you have the accelerator on and the alternator is running fine when you stop it will drop to low output a little bit of revs picks it up thanks for replys Quote Link to comment Share on other sites More sharing options...
mjt Posted December 3, 2009 Share Posted December 3, 2009 First thing to check is the alternator drive belt. It might be slipping. Next check the battery connections are clean and tight. Worth doing as this won't cost you anything. If neither of these cure the problem then proceed as advised above. Quote Link to comment Share on other sites More sharing options...
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