Its not there to compensate high demand as is the common misconception. The problem comes on a jump start, when the PCM sees a cold engine, and then a poor battery condition, and can then instantly zap out about 18 volts because its trying to recover the battery. Unfortunately this sudden surge can cook modules.
On more than just on forum, I got the distinct impression that the Ford Focus had some sort of mystery surrounding my Battery light symptom. At least four instances were cited where the post indicated both battery and alternator replacement did not resolve their battery light issues. $120 for a battery, $600-800 I read were typical costs for
The best brands for the FORD Focus Mk2 Hatchback (DA_, HCP, DP) 2.5ST 2005 - 2012 225hp / 166kW in the category Alternator are: RIDEX. CV PSH. AS-PL. LUCAS ELECTRICAL. STARK. TOP products for your car : DENSO DAN1059 , HERTH+BUSS ELPARTS 32083070 , ALANKO 10443745 , CV PSH 815.527.150.260 CV PSH 595.581.120.410.
After changing my cars Alternation/Generator to another from the scrap yard, i started to see this warning light after few weeks. The light is still there fo
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4 posts · Joined 2011. #1 · Apr 25, 2011. battery light came on - scanned code of 1246 came up - replaced alternator and battery light still on - with engine running, pulling 14.9 volts accross battery - engine off, 13 volts accross battery - code 1246 says Fault Location - alternator; Probable Cause - alternator, drive belt, wiring, ECM Alternator Check. put a meter across the battery. Remember when you remove the smart charge 3 pin plug from the back of the alternator, it reverts to a conventional alternator! If you do not have about 13.8 volts, carry out basic charging system checks and suspect the alternator, its not a smart charge fault ! idxm4.
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    • ford focus mk2 alternator problems