hi any help would be greatly appreciated ,

my 53 plate focus rs had a new alternator earlier this week , now i cant get rid of the battery light on the dash , i,v tested the alternator whilst a/c , fog lights on ,rear clear screen on etc , its charging perfect around 14.5 v
just cant get the light out , tried it on an snap on scanner to no avail

any ideas
many thanks
blan77

 

the wiring loom to the plug on the alternator fella causes loadsa problems on these ,follow it back in the loom .also have a bloody good look at the plug, this is smart charge i presume, if it is try the above, if no luck unplug the plug the alternator will default and charge at 50 amps warning light out if it doesnt do this the alternator is faulty fella hope this helps

 

can anyone shed any light on this subject please ......thanks again

 

as said mate, have you checked the multi plug that goes into the alternator? will have three wires coming out of it,

Check these wires as they can break, common issue.

 

Also try your fusebox for any blown fuses,I had this on an xr2i,wasn't an obvious fuse either but after changing the alternator on my mums drive using only a few basic crap happy shopper tools and a tablelamp in the rain I was mighty pissed off the batt light still glowed,before the days of Internet forums I'm afraid!!!
Checked fuses and one had blown,changed it and the batt light went off!!!!!

 

Isn't 14.5 volts a little high ? I thought normally they should be around 12.5 and if the alternator was overcharging it would cause the light to be on ?

 

err 14 5 is not high focus smart charge will get to 16 volts most regulators are set to 14 8BLAN77 READ YOUR POSTS i have given u the most common problems

 

fuse box under bonet has been checked , fuse box behind glove box also , all ok .
put a new smart charge lead on it ,
still got the battery light on ,its doing my head in ARRRRRRRRRHHHHH

 

Ive had the same prob on my 2001 1.8 zetec petrol ,ive traced the wires back to the ecu plug ,done continuity test on the wires and all were ok,all that the wires do that come from that plug on the alternator is for the ecu to read the out put voltage of the alternator ,and the ecu puts the battery light on or off , my light comes on intermitant ,the prob is there fore in the ecu ,i know all this cos i contacted the diagnostic doctor in a certain car mag ,there are loads with the same prob ,i got fooled by it and fitted a new alternator at first (110 pound down the drain) so long as you know your battery and alternator are ok you could just live with it ,my light has gone off and not been on for few months ,but other times it flicks on and off ,i dont know if there is a fix for thr ecu ,hope this helps (14+volts at the batery with engine running is correct).

 

I had this with my TDCi mondeo turned out to be the battery so have you had that checked??
It was 2 weeks old and even tho it was starting the car ok everytime when we put the drop tester on it it was nackered so had another new one all been fine since

 

Read this link it's an idiots guide to Focus alternators.... Helped me this week...

http://www.petercoopercarrepairs.co....t_charging.htm